Document:

AMENDMENT AGREEMENT

      THIS AMENDMENT AGREEMENT is made and entered into as of the 19th day of
March 2000 by and between Ambient Corporation, a Delaware corporation
(hereinafter "Ambient" or the "Company") and Grove Industries Ltd. (hereinafter
the "Consultant").

                                   WITNESSETH

      WHEREAS, the Company and Consultant entered into an agreement in February
2000 and wish to amend the same;

      NOW THEREFORE, in consideration of the mutual promises, covenants and
undertakings of the parties, it is hereby agreed:

1.    Section 1 of the agreement shall be deleted and replaced with the
      following section. All other terms and conditions shall remain the same.

      "Compensation. For services rendered hereunder, and in full and final
      payment thereof, the Company hereby issues to Consultant 700,000 shares of
      the Company's Common Stock (the "Securities")."

      IN WITNESS WHEREOF, the parties have executed this Agreement as of the
date first above written.

Ambient Corporation                 Grove Industries Ltd.

-------------------------           -----------------------------------
                                    CORPMAN INC.
                                    Director
                                    represented by Margaret GrantExhibit 10.15
                                    AGREEMENT

This Agreement is made as of March 27th, 2000 by and between Lingfield Limited
(hereinafter "Lingfield") and Ambient Corporation (hereinafter "Company").

THE PARTIES AGREE AS FOLLOWS:

1. Term

1.1 The term of this Agreement shall extend for 12 months from the date hereof
(the "Term"), provided, that, prior to such date this Agreement shall be deemed
terminated and of no further force or effect upon the (i) Company's insolvency,
liquidation, dissolution or commencement of any bankruptcy proceeding and (ii)
delivery by either party to the other upon thirty (30) days prior written notice
of such party's intention to terminate this Agreement.

1.2 Upon the termination, cancellation or expiration of this Agreement in
accordance with the provisions hereof, neither party shall be responsible or
liable to the other for consequential or incidental damages of any kind.

2. Services. Lingfield shall provide the following services (the "Services"):

o Assist the Company or its affiliates in meeting appropriate potential
strategic partners and investors, including but not limited to venture capital
firms, individual and institutional investors, and strategic partners;

o Support the follow-up efforts and negotiations as requested and appropriate.

      In performance of the Services hereunder, Lingfield shall act only in
accordance with the Company's instructions, terms and conditions. Lingfield
shall report regularly to the Company with respect to Lingfield's activities
hereunder, including periodic meetings with Company personnel.

3. Compensation. In consideration of the Services, Lingfield shall be issued
346,250 shares of the Company's common stock.

4. Expenses

      Company shall reimburse Lingfield for all expenses incurred in providing
its services under this Agreement up to an aggregate of $500 per month. Expenses
over $500 per month must be preapproved in writing by the Company.

      Company will make such reimbursement to Lingfield within thirty (30) days
after a statement of expenses (with appropriate supporting documents) has been
sent to Company.
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                                       2

5. Confidential Information. The Parties shall execute the Company's Reciprocal
Confidentiality Agreement.

6. Governing Law. This Agreement shall be governed by and construed in
accordance with the laws of the State of New York without regard to conflicts of
laws principles.

7. Arbitration. Any controversy or claim between the parties arising out of or
relating to this Agreement or the breach hereof shall be settled by binding
arbitration in accordance with the Commercial Arbitration Rules of the American
Arbitration Association, and judgment upon the award rendered by the
arbitrator(s) may be entered in any court having jurisdiction thereof. The
arbitration shall be held in the State of New York.

8. Representations and Warranties. Each Party represents and warrants that it
has the right to enter into this Agreement, to fully perform its obligations
hereunder, that it has acquired all rights necessary for the exercise of all
rights hereunder, that the materials and technology supplied herein will not
violate or infringe upon any trademark, trade name, copyright, right of privacy
or publicity, patent, property right or any other right of any third party.

9. Modification. This Agreement may not be modified except by a written
agreement signed by both parties.

10. Entire Agreement. This Agreement sets forth the entire agreement and
understanding between Company and Lingfield relating to the subject matter
herein and merges all prior and contemporaneous agreements between the parties.

11. Further Assurances. The parties shall each perform such acts, execute and
deliver such instruments and documents, and do all such other things as may be
reasonably necessary to accomplish the transactions contemplated by this
Agreement.

12. Assignment. This Agreement is personal to Lingfield and Lingfield shall not
assign or delegate its rights or duties to a third party, whether by contract,
will or operation of law, without the Company's prior written consent.

13. Agency. Lingfield acknowledges and agrees that it is an independent
contractor, is not the agent of the Company and has no authority in such
capacity to bind or commit the Company by or to any contract or otherwise.
Lingfield is not, expressly or by implication, an employee of the Company for
any purpose whatsoever.
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                                       3

IN WITNESS WHEREOF, the parties have executed this Agreement as of the date
first above written.

LINGFIELD LIMITED                               AMBIENT CORPORATION

Name: S/ Anthony Charles                        By S/ Aryeh Weinberg
      ------------------                           -----------------
Title: Director                                 Title:Exhibit 10.16
                              CONSULTING AGREEMENT

      CONSULTING AGREEMENT made and entered into as of the 19th day of February
2000 by and between Ambient Corporation, a Delaware Corporation (herineafter the
"Company") and Trax Investments Ltd. ( herineafter the "Consultant").

                               W I T N E S S E T H

      WHEREAS, the Company is in the business of developing and marketing
various power line telecommunications products and components, and

      WHEREAS, the Consultant is in the business of providing financial, and
advisory services (hereinafter the "Services") , and

      WHEREAS, the Company wishes to have the Consultant provide the Services,
which the Company deems critical to its operations

      NOW, THEREFORE, in consideration of the mutual promises, covenants and
undertakings of the parties, it is hereby agreed:

1. Engagement & Duties.

      1.1 The Company hereby engages Consultant and the Consultant agrees to
provide advice and services to the Company related to the Services. Consultant
shall devote such time and effort to the consulting services hereunder as is
necessary and proper for the fulfillment of Consultant's obligations hereunder.

      1.2 Consultant shall report regularly to the Director of the Company with
respect to Consultant's activities hereunder.

2. Compensation For services rendered hereunder the Company hereby (i) issues to
Consultant 589,750 shares of the Company's Common Stock (the Securities.") and
(ii) shall pay to the Consultant the sum of $5,000 per month.

3. Representations of Consultant Respecting the Securities.

      3.1 General Restriction on Transfer. Except for transfers otherwise
permitted by this Agreement or applicable law, Consultant agrees that it will
not transfer any of the Securities.

      3.2 Not for Resale. Consultant represents that it is acquiring the
Securities for investment for its own account and not with a view to, or for
resale in connection with, the distribution or other disposition thereof.
Consultant agrees that it will not, directly or indirectly, offer, transfer,
sell, assign, pledge, hypothecate or otherwise dispose of (each a "Transfer")
any of the Securities unless such Transfer complies with the provisions of this
Agreement and (i) the Transfer is pursuant to an effective registration
statement under the Securities Act of 1933, as amended, and the rules and
regulations in effect thereunder (the "Securities Act"), or (ii) counsel for
Consultant shall have furnished the Company with an opinion, reasonably
acceptable to the Company, that no such registration is required because of the
availability of an exemption under the Securities Act.

      3.3 Certain Permitted Transfers. Notwithstanding the general prohibition
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                                       2

      on Transfers contained herein, the Company acknowledges and agrees that
      any Transfer in a private transaction which does not include a public
      distribution is permitted and need not require an opinion of counsel,
      provided, that prior to such Transfer, the transferee shall deliver to the
      Company a valid written undertaking to be bound by the terms of this
      Agreement.

4. Proprietary Information

      4.1 The term "Information" means any and all confidential and proprietary
information including but not limited to any and all specifications, formulae,
prototypes, software design plans, computer programs, and any and all records,
data, methods, techniques, processes and projections, plans, marketing
information, materials, financial statements, memoranda, analyses, notes, and
other data and information (in whatever form), as well as improvements and
know-how related thereto, relating to the Company or its products. Information
shall not include information that (a) was already known to or independently
developed by the Consultant prior to its disclosure as demonstrated by
reasonable and tangible evidence satisfactory to the Company; (b) shall have
appeared in any printed publication or patent or shall have become part of the
public knowledge except as a result of breach of this Agreement by the
Consultant or similar agreements by other Company consultants or employees (c)
shall have been received by the Consultant from another person or entity having
no obligation to the Company or (d) is approved in writing by the Company for
release by the Consultant.

      4.2 The Consultant agrees to hold in trust and confidence all Information
disclosed to it and further agrees not to exploit or disclose the Information to
any other person or entity or use the Information directly or indirectly for any
purpose other than for its work with the Company.

      4.3 The Consultant agrees to disclose the Information only to persons
necessary in connection with its work with the Company and who have undertaken
the same confidentiality obligations set forth herein in favor of the Company.
The Consultant agrees to assume full responsibility for the confidentiality of
the Information disclosed to it and to prevent its unauthorized disclosure, and
shall take appropriate measures to ensure that such persons acting on his behalf
are bound by a like covenant of secrecy.

      4.4 The Consultant acknowledges and agrees that the Information furnished
hereunder is and shall remain proprietary to the Company. Unless otherwise
required by statute or government rule or regulation, all copies of the
Information, shall be returned to the Company immediately upon request without
retaining copies thereof.

5. General Provisions

      5.1 This Agreement constitutes the entire agreement between the parties
with respect to the subject matter hereof, and shall not be amended, modified or
varied by any oral agreement or representation or otherwise other than by a
written instrument executed by both parties or their duly authorized
representatives.

      5.2 No failure, delay or forbearance by a party in exercising any power or
right hereunder shall in any way restrict or diminish such party's rights and
powers under this Agreement, or operate as a waiver of any breach or
non-performance by either party of any of the terms or conditions hereof.

      5.3 If any term or provision of this Agreement shall be declared invalid,
illegal or unenforceable, then such term or provision shall be enforceable to
the extent that a court shall

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deem it reasonable to enforce such term or provision and if such term or
provision shall be unenforceable, such term or provision shall be severed and
all remaining terms and provisions shall be unaffected and shall continue in
full force and effect.

      5.4 The terms and conditions of this Agreement supersede those of all
previous agreements and arrangements, either written or oral between the Company
and Consultant relating to the subject thereof.

      5.5 Consultant acknowledges and agrees that he is an independent
contractor, is not the agent of the Company and has no authority in such
capacity to bind or commit the Company by or to any contract or otherwise.
Consultant is not, expressly or by implication, an employee of the Company for
any purpose whatsoever.

      5.6 This Agreement shall be interpreted, construed and governed in
accordance with the law of the State of New York

      IN WITNESS WHEREOF, the parties have executed this Agreement as of the
date first above written.

Ambient Corporation                       Trax Investments Ltd.
                                          By its Director HTL Corp Services

S/Aryeh Weinberg                          S/ Derrick Harper
----------------                          -----------------

                                          S/ Peter Goulden
                                          ----------------

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