How to contact Dave about doing a circuit for pay - Page 1
Forum section: electronics / beginners

author: Mr 12
author_rank: Contributor
timestamp: February 16, 2016, 08:10:36 pm
content: Anyone know if Dave will do request circuit schematic for pay?I am wanting to replace a 6V SLA battery with a 7.2V Sony Li-Ion camera battery.I must limit the charge peak 8.4V to a max of 7.3V and hope to not draw current after reaching the 7.3V and lower as the battery draws down to extend battery life.

author: SeanB
author_rank: Super Contributor
timestamp: February 16, 2016, 08:16:38 pm
content: 2 chances, and the best one is pretty slim........However, you can easily get a battery management board which will handle the battery itself ( if the Sony one does not have one in it already to do the undervoltage and charge protection) so leaving you just to put in a simple 2S lithium charge board, which handles charging the cell and connecting the load to it all in a small package. All available pre built on a PCB from your favourite PRC suppliers, or you can build them up from separate parts if you can design a PCB.

author: Divvi
author_rank: Contributor
timestamp: February 16, 2016, 09:48:49 pm
content: Quote from: Mr 12 on February 16, 2016, 08:10:36 pmShort answer: NoHe has stated multiple times on the Amp Hour that he doesn't like doing contract work.

author: EEVblog
author_rank: Unknown
timestamp: February 16, 2016, 09:57:43 pm
content: You failed the first test of not being to contact me! So that automatically rules you outBut no, I don't do contract work any more anyway.

author: Audioguru
author_rank: Super Contributor
timestamp: February 17, 2016, 01:20:45 am
content: Before you cause a Lithium Ion battery to explode or catch on fire (difficult to extinguish) you should learn about the basics. Go towww.batteryuniversity.com.This battery has a label that says for you to use its specified charger only. Its voltage is lower than normal so maybe it is a Lithium-ferrous type instead of a normal lithium-cobalt type.

author: timb
author_rank: Super Contributor
timestamp: February 17, 2016, 01:27:25 am
content: Send me a pm, I do contract work.

author: Mr 12
author_rank: Contributor
timestamp: February 17, 2016, 05:35:23 am
content: Thanks Dave,I really do appreciate all your hard work and Youtube!I thought it would be worth a shot over the bow to see if I could land a good schematic to work from.Thanks allAudioguru I am not charging a battery to see it explode!

author: Psi
author_rank: Super Contributor
timestamp: February 17, 2016, 06:37:30 am
content: I'm sure Dave would design your circuit, if you offered $100,000

author: VK5RC
author_rank: Unknown
timestamp: February 17, 2016, 07:47:37 am
content: I don't think Dave would, he has expressed that opinion many times.To the OP, 'have a go' with a schematic after some research, google is useful, put it up, I am sure you will get criticism both constructive and otherwise, choose carefully which you listen to and go from there.

author: dadler
author_rank: Unknown
timestamp: February 17, 2016, 08:16:52 am
content: You should also consider looking for an electronics forum to ask on--you may be able to find someone to help you or answer your questions.