Document:

Exhibit
10.1

 

PROMISSORY
NOTE

 

	Principal
    Amount: $130,000.00	August
    9, 2021

 

FOR
VALUE RECEIVED, Brain Scientific Inc., a corporation incorporated under the laws of the State of Nevada, having as its address at
125 Wilbur Place, Ste 170, Bohemia, NY 11716 (the “Borrower”), hereby promises to pay to the order of Piezo Motion Corp.,
a corporation incorporated under the laws of the State of Delaware, having its address at 6700 Professional Parkway, Sarasota FL 34240,
or its successors or assigns (the “Holder”), the principal amount of One Hundred Thirty Thousand United States Dollars (US$130,000.00)
by no later than September 30, 2021 (as may be extended pursuant to the term hereof, the “Maturity Date”) and to pay interest
on the principal amount outstanding hereunder at the rate of zero percent (0%) per annum commencing on the date hereof (“Issuance
Date”). This Promissory Note, as may be amended or supplemented from time to time, shall be referred to herein as the “Note”.

 

1.
Defined Terms. For purposes of this Note, except as otherwise expressly provided or otherwise defined elsewhere in this Note,
or unless the context otherwise requires, the capitalized terms in this Note shall have the meanings assigned to them as follows:

 

1.1
“Assets” means all of the properties and assets of the Person in question, as the context may so require, whether
real, personal or mixed, tangible or intangible, wherever located, whether now owned or hereafter acquired.

 

1.2
“Borrower” shall have the meaning given to it in the preamble hereof.

 

1.3
“Business Day” shall mean any day other than a Saturday, Sunday or a legal holiday on which federal banks are authorized
or required to be closed for the conduct of commercial banking business.

 

1.4
“Consent” means any consent, approval, order or authorization of, or any declaration, filing or registration with,
or any application or report to, or any waiver by, or any other action (whether similar or dissimilar to any of the foregoing) of, by
or with, any Person, which is necessary in order to take a specified action or actions, in a specified manner and/or to achieve a specific
result.

 

1.5
“Event of Default” shall have the meaning given to it in Section 3.1.

 

1.6
“Exchange Act” means the Securities Exchange Act of 1934, as amended.

 

1.7
“Governmental Authority” means any foreign, federal, state or local government, or any political subdivision thereof,
or any court, agency or other body, organization, group, stock market or exchange exercising any executive, legislative, judicial, quasi-judicial,
regulatory or administrative function of government.

 

1.8
“Holder” shall have the meaning given to it in the preamble hereof.

 

1.9
“Law” means any provision of any law, statute, ordinance, code, constitution, charter, treaty, rule or regulation
of any Governmental Authority.

 

1.10
“Maturity Date” shall have the meaning given to it in the preamble hereof.

 

1.11
“Note” shall have the meaning given to it in the preamble hereof.

 

    	 	1	 

     

    

 

1.12
“Obligations” means, now existing or in the future, any debt, liability or obligation of any nature whatsoever (including
any required performance of any covenants or agreements), whether secured, unsecured, recourse, nonrecourse, liquidated, unliquidated,
accrued, voluntary or involuntary, direct or indirect, absolute, fixed, contingent, ascertained, unascertained, known, unknown, whether
or not jointly owed with others, whether or not from time to time decreased or extinguished and later decreased, created or incurred,
or obligations existing or incurred under this Note, or any other agreement between any of the Borrower and the Holder, as such obligations
may be amended, supplemented, converted, extended or modified from time to time.

 

1.13
“Person” means any individual, sole proprietorship, joint venture, partnership, company, corporation, association,
cooperation, trust, estate, Governmental Authority, or any other entity of any nature whatsoever.

 

1.14
“Subsidiary” means any Person in which the Borrower, directly or indirectly, (i) owns or acquires any of the outstanding
capital stock or holds any equity or similar interest of such Person or (ii) controls or operates all or any part of the business, operations
or administration of such Person, and all of the foregoing, collectively, “Subsidiaries.”

 

2.
Payments of Principal and Interest; Additional Terms.

 

2.1
Payment of Principal. The principal amount of this Note shall be paid to the Holder no later than the Maturity Date.

 

2.2
Payment of Interest. Except as otherwise provided herein, all interest on the principal amount of this Note shall be paid to the
Holder on the Maturity Date.

 

2.3
General Payment Provisions. All payments of principal and interest, if any, on this Note shall be made in lawful money of the
United States of America by wire transfer to such account as the Holder may designate by written notice to the Borrower in accordance
with the provisions of this Note. Whenever any amount expressed to be due by the terms of this Note is due on any day which is not a
Business Day, the same shall instead be due on the next succeeding Business Day.

 

2.4
Prepayment. At any time, upon receiving the written consent of the Holder, the Borrower may pre-pay this Note without penalty.

 

3.
Defaults and Remedies.

 

3.1
Events of Default. An “Event of Default” means:

 

		3.1.1	the
                                            Borrower shall fail to pay any interest, principal or other charges due under this Note on
                                            the date when any such payment shall be due and payable;

 

		3.1.2	the
                                            Borrower shall fail to perform, comply with or abide by any of the stipulations, agreements,
                                            conditions and/or covenants contained in this Note on the part of the Borrower to be performed
                                            complied with or abided by;

 

		3.1.3	the
                                            bankruptcy, insolvency, reorganization or liquidation proceedings or other proceedings for
                                            the relief of debtors shall be instituted by or against the Borrower or any Subsidiary and,
                                            if instituted against the Borrower or any Subsidiary by a third party, shall not be dismissed
                                            within forty-five (45) days of their initiation;

 

    	 	2	 

     

    

 

		3.1.4	the
                                            commencement by the Borrower or any Subsidiary of a voluntary case or proceeding under any
                                            applicable federal, state or foreign bankruptcy, insolvency, reorganization or other similar
                                            law or of any other case or proceeding to be adjudicated a bankrupt or insolvent, or the
                                            consent by it to the entry of a decree, order, judgment or other similar document in respect
                                            of the Borrower or any Subsidiary in an involuntary case or proceeding under any applicable
                                            federal, state or foreign bankruptcy, insolvency, reorganization or other similar law or
                                            to the commencement of any bankruptcy or insolvency case or proceeding against it, or the
                                            filing by it of a petition or answer or consent seeking reorganization or relief under any
                                            applicable federal, state or foreign law, or the consent by it to the filing of such petition
                                            or to the appointment of or taking possession by a custodian, receiver, liquidator, assignee,
                                            trustee, sequestrator or other similar official of the Borrower or any Subsidiary or of any
                                            substantial part of its property, or the making by it of an assignment for the benefit of
                                            creditors, or the execution of a composition of debts, or the occurrence of any other similar
                                            federal, state or foreign proceeding, the taking of corporate action by the Borrower or any
                                            Subsidiary in furtherance of any such action or the taking of any action by any Person to
                                            commence a Uniform Commercial Code foreclosure sale or any other similar action under federal,
                                            state or foreign law;

 

		3.1.5	the
                                            entry by a court of (i) a decree, order, judgment or other similar document in respect of
                                            the Borrower or any Subsidiary of a voluntary or involuntary case or proceeding under any
                                            applicable federal, state or foreign bankruptcy, insolvency, reorganization or other similar
                                            law or (ii) a decree, order, judgment or other similar document adjudging the Borrower or
                                            any Subsidiary as bankrupt or insolvent, or approving as properly filed a petition seeking
                                            liquidation, reorganization, arrangement, adjustment or composition of or in respect of the
                                            Borrower or any Subsidiary under any applicable federal, state or foreign law or (iii) a
                                            decree, order, judgment or other similar document appointing a custodian, receiver, liquidator,
                                            assignee, trustee, sequestrator or other similar official of the Borrower or any Subsidiary
                                            or of any substantial part of its property, or ordering the winding up or liquidation of
                                            its affairs, and the continuance of any such decree, order, judgment or other similar document
                                            or any such other decree, order, judgment or other similar document unstayed and in effect
                                            for a period of thirty (30) consecutive days;

 

		3.1.6	the
                                            Borrower shall fail to maintain the listing or quotation of its common stock on at least
                                            one of the OTC Pink, OTCQB, Nasdaq National Market, Nasdaq Small Cap Market, New York Stock
                                            Exchange, NYSE MKT, or an equivalent replacement exchange; or

 

		3.1.7	the
                                            Borrower shall fail to file when due all reports under the Exchange Act (including but not
                                            limited to becoming delinquent in its filings); and/or the Borrower shall cease to be subject
                                            to the reporting requirements of the Exchange Act.

 

		3.1.8	[RESERVED]

 

    	 	3	 

     

    

 

3.2
Remedies. Upon the occurrence of an Event of Default that is not timely cured within an applicable cure period hereunder, the
Holder may, in its sole discretion, accelerate full repayment of all principal amounts outstanding hereunder, together with accrued interest
thereon, together with all attorneys’ fees, paralegals’ fees and costs and expenses incurred by the Holder in collecting
or enforcing payment hereof (whether such fees, costs or expenses are incurred in negotiations, all trial and appellate levels, administrative
proceedings, bankruptcy proceedings or otherwise), and together with all other sums due by the Borrower hereunder, all without any relief
whatsoever from any valuation or appraisement laws, and payment thereof may be enforced and recovered in whole or in part at any time
by one or more of the remedies provided to the Holder at law, in equity, or under this Note. Any amount of principal or interest on this
Note which is not paid when due shall bear interest at the rate of ten percent (10%) per annum.

 

4.
Representations and Warranties.

 

4.1
Organization. The Borrower is a corporation duly incorporated, validly existing and in good standing under the Laws of Nevada
and has the full power and authority and all necessary certificates, licenses and approvals: (i) to enter into and execute this Note
and to perform all of its Obligations hereunder; and (ii) to own and operate its Assets and properties and to conduct and carry on its
business as and to the extent now conducted. The Borrower is duly qualified to transact business and is in good standing as a foreign
entity in each jurisdiction where the character of its business or the ownership or use and operation of its Assets or properties requires
such qualification, except as would not have an material adverse effect. The exact legal name of the Borrower is as set forth in the
preamble to this Note, and the Borrower does not currently conduct business under any other name or trade name.

 

4.2
Authority and Approval of Agreement; Binding Effect. The execution and delivery by the Borrower of this Note, and the performance
by the Borrower of all of its Obligations hereunder, has been duly and validly authorized and approved by the Borrower and, its directors
or shareholders, as required, pursuant to all applicable Laws and no other action or Consent on the part of its board, shareholders or
any other Person is necessary or required by the Borrower to execute this Note, consummate the transactions contemplated herein, perform
all of its Obligations hereunder. This Note has been duly and validly executed by the Borrower (and the officer executing this Note is
duly authorized to act and execute same on behalf of the Borrower) and constitutes the valid and legally binding agreement of the Borrower,
enforceable against the Borrower in accordance with its terms, except as such enforceability may be limited by general principles of
equity or applicable bankruptcy, insolvency, reorganization, moratorium, liquidation and other similar laws relating to, or affecting
generally, the enforcement of applicable creditors’ rights and remedies.

 

5.
Covenants.

 

5.1
Legal Existence. The Borrower shall at all times preserve and maintain its: (i) existence and good standing in the jurisdiction
of its organization; and (ii) its qualification to do business and good standing in each jurisdiction where the nature of its business
makes such qualification necessary, and shall at all times continue as a going concern in the business which the Borrower is presently
conducting.

 

5.2
Notice of Default. The Borrower shall, promptly, but not more than one (1) Business Day after the commencement thereof, give notice
to the Holder in writing of the occurrence of any “Event of Default” or of any event which, with the lapse of time, the giving
of notice or both, would constitute an Event of Default hereunder.

 

6.
Miscellaneous.

 

6.1
Lost or Stolen Note. Upon notice to the Borrower of the loss, theft, destruction or mutilation of this Note, and, in the case
of loss, theft or destruction, of an indemnification undertaking by the Holder to the Borrower in a customary and reasonable form and,
in the case of mutilation, upon surrender and cancellation of the Note, the Borrower shall execute and deliver a new Note of like tenor
and date and in substantially the same form as this Note.

 

    	 	4	 

     

    

 

6.2
[RESERVED].

 

6.3
Severability. In the event any one or more of the provisions of this Note shall for any reason be held to be invalid, illegal,
or unenforceable, in whole or in part, in any respect, or in the event that any one or more of the provisions of this Note operates or
would prospectively operate to invalidate this Note, then and in any of those events, only such provision or provisions shall be deemed
null and void and shall not affect any other provision of this Note. The remaining provisions of this Note shall remain operative and
in full force and effect and shall in no way be affected, prejudiced, or disturbed thereby.

 

6.4
Cancellation. After all principal, accrued interest and other amounts at any time owed on this Note has been indefeasibly paid
or satisfied in full, this Note shall automatically be deemed canceled, shall be surrendered to the Borrower for cancellation and shall
not be re-issued.

 

6.5
Entire Agreement and Amendments. This Note represents the entire agreement between the parties hereto with respect to the subject
matter hereof and thereof, and there are no representations, warranties or commitments, except as set forth herein. This Note may be
amended only by an instrument in writing executed by the parties hereto.

 

6.6
Binding Effect. This Note shall be binding upon the Borrower and the successors and assigns of the Borrower and shall inure to
the benefit of the Holder and the successors and assigns of the Holder.

 

6.7
Governing Law and Venue. The Borrower and Holder each irrevocably agrees that any dispute arising under, relating to, or in connection
with, directly or indirectly, this Note or related to any matter which is the subject of or incidental to this Note (whether or not such
claim is based upon breach of contract or tort) shall be subject to the exclusive jurisdiction and venue of the state and/or federal
courts located in New York. This provision is intended to be a “mandatory” forum selection clause and governed by and interpreted
consistent with Nevada law. The Borrower and Holder each hereby consents to the exclusive jurisdiction and venue of any state or federal
court having its situs in the State of New York, and each waives any objection based on forum non conveniens. The Borrower hereby waives
personal service of any and all process and consent that all such service of process may be made by certified mail, return receipt requested,
directed to the Borrower, as set forth herein in the manner provided by applicable statute, law, rule of court or otherwise. All terms
and provisions hereof and the rights and obligations of the Borrower and Holder hereunder shall be governed, construed and interpreted
in accordance with the laws of the State of Nevada, without reference to conflict of laws principles.

 

6.8
Remedies, Characterizations, Other Obligations, Breaches and Injunctive Relief. The remedies provided in this Note shall be cumulative
and in addition to all other remedies available under this Note, at law or in equity.

 

6.9
Specific Shall Not Limit General; Construction. No specific provision contained in this Note shall limit or modify any more general
provision contained herein. This Note shall be deemed to be jointly drafted by the Borrower and the Holder and shall not be construed
against any person as the drafter hereof.

 

6.10
Failure or Indulgence Not Waiver. No failure or delay on the part of this Note in the exercise of any power, right or privilege
hereunder shall operate as a waiver thereof, nor shall any single or partial exercise of any such power, right or privilege preclude
other or further exercise thereof or of any other right, power or privilege.

 

6.11
Notice. Notice shall be given to each party such other address as provided to the other party in writing.

 

6.12
Transfer. This Note may be transferred by the Holder without the consent of the Borrower.

 

6.13
Collection Costs. If (a) this Note is placed in the hands of an attorney for collection or enforcement or is collected or enforced
through any legal proceeding or the Borrower otherwise takes action or incurs costs to collect amounts due under this Note or to enforce
the provisions of this Note or (b) there occurs any bankruptcy, reorganization, receivership of the Borrower or other proceedings affecting
creditors’ rights and involving a claim under this Note, then the Borrower shall pay the costs incurred by the Holder for such
collection, enforcement or action or in connection with such bankruptcy, reorganization, receivership or other proceeding, including,
without limitation, attorneys’ fees and disbursements.

 

[signature
page follows]

 

    	 	5	 

     

    

 

IN
WITNESS WHEREOF, the parties have caused this Note to be executed on and as of the Issuance Date.

 

	 	Brain
    Scientific, Inc.
	 	as
    Borrower
	 	 	 
	 	By:	/s/
    Boris Goldstein
	 	Name:	Boris
    Goldstein
	 	Title:	Chairman
	 	 	 
	 	Piezo
    Motion Corp.
	 	as
    Holder
	 	 	 
	 	By:	/s/
    Hassan Kotob
	 	Name:	Hassan
    Kotob
	 	Title:	Chief
    Executive Officer

 

Date:
July 8, 2021

 

Principal
Amount: $130,000.00

 

[Signature
page to Promissory Note ]

 

 

6Document

ADDENDUM TO THE

THIRD AMENDED AND RESTATED ADVISORY AGREEMENT 
BETWEEN 
GREENBACKER RENEWABLE ENERGY COMPANY LLC 
GREENBACKER RENEWABLE ENERGY CORPORATION 
AND 
GREENBACKER CAPITAL MANAGEMENT LLC

THIS ADDENDUM TO THE THIRD AMENDED AND RESTATED ADVISORY AGREEMENT (the “ADDENDUM”) is entered into as of the 9th day of May, 2021, with an effective date of July 1, 2021, by and between GREENBACKER RENEWABLE ENERGY COMPANY LLC, a Delaware limited liability company (the “Company”), GREENBACKER RENEWABLE ENERGY CORPORATION, a Maryland corporation (the “Operating Corp.”), and GREENBACKER CAPITAL MANAGEMENT LLC, a Delaware limited liability company (the “Advisor”).

WHEREAS, the Company and the Advisor entered into the Third Amended and Restated Advisory Agreement, dated September 1, 2020 (the “Advisory Agreement”) to continue the retention of the Advisor to furnish advisory and management services to the Company and its subsidiaries on the terms and conditions therein (the “Third Amended and Restated Advisory Agreement”); and

WHEREAS, the Company and the Advisor wish to amend certain terms of the Third Amended and Restated Advisory Agreement by entering into this Addendum.  All capitalized terms used in this Addendum but not defined herein shall have the meanings ascribed to them in the Third Amended and Restated Advisory Agreement.

NOW, THEREFORE, in consideration of the premises and for other good and valuable consideration, the parties hereby agree as follows: 

1.The third paragraph of the Third Amended and Restated Advisory Agreement shall hereby be deleted and replaced in its entirety with the following:

3.Compensation of the Advisor. During the Initial Term and any Renewal Term (each as defined in Section 9(a) hereof), the Company shall pay or cause to be paid periodically in arrears a base management fee (“Base Management Fee”) calculated as an annual percentage of the Net Asset Value (as defined below) in accordance with the following schedule:

						
	Net Asset Value 
	Base Management Fee

	$1 to $800,000,000
	2.00% (0.167% monthly)

	$800,000,001 to $1,500,000,000
	1.75% (0.14583% monthly)

	Greater than $1,500,000,000
	1.50% (0.125% monthly)

“Net Asset Value” is defined as the net fair market value of all of the Company’s assets, including investments in bank accounts, money market funds or other current assets, as determined by the Board of Directors from time to time pursuant to the Company’s limited liability company operating agreement in effect at the time of the calculation. 

The Base Management shall be payable at least monthly but not more frequently than weekly. The Base Management Fee for any partial period shall be appropriately pro-rated. The Advisor may elect, in its sole discretion, to defer or waive all or a portion of the Base Management Fee. Any portion of a deferred Base Management Fee not taken as to any period shall be deferred without interest and may be taken by the Advisor in any other period prior to the occurrence of a Liquidity Event (as such term is defined in the LLC Agreement) as the Advisor may determine in its sole discretion.

***
1

IN WITNESS WHEREOF, the parties hereto have caused this Agreement to be duly executed on the date above written.

						
	GREENBACKER RENEWABLE ENERGY COMPANY LLC
	
	

By: /s/ Richard C. Butt

	Name: Richard C. Butt
Title: Chief Financial Officer

		
	
	
	GREENBACKER CAPITAL MANAGEMENT LLC
	

By: /s/ Charles Wheeler
	
	Name: Charles Wheeler
Title: President

	
	GREENBACKER RENEWABLE ENERGY CORPORATION
	

By: /s/ Richard C. Butt
	
	Name: Richard C. Butt
Title: Chief Financial Officer

2

3

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