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Electronics => Beginners => Topic started by: Mr 12 on February 16, 2016, 08:10:36 pm

Title: How to contact Dave about doing a circuit for pay
Post by: Mr 12 on February 16, 2016, 08:10:36 pm
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.


 
Title: Re: How to contact Dave about doing a circuit for pay
Post by: SeanB on February 16, 2016, 08:16:38 pm
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.
Title: Re: How to contact Dave about doing a circuit for pay
Post by: Divvi on February 16, 2016, 09:48:49 pm
Quote from: Mr 12 on February 16, 2016, 08:10:36 pm
Anyone know if Dave will do request circuit schematic for pay?

Short answer: No

He has stated multiple times on the Amp Hour that he doesn't like doing contract work.
Title: Re: How to contact Dave about doing a circuit for pay
Post by: EEVblog on February 16, 2016, 09:57:43 pm
You failed the first test of not being to contact me! So that automatically rules you out  ;D
But no, I don't do contract work any more anyway.
Title: Re: How to contact Dave about doing a circuit for pay
Post by: Audioguru on February 17, 2016, 01:20:45 am
Before you cause a Lithium Ion battery to explode or catch on fire (difficult to extinguish) you should learn about the basics. Go to www.batteryuniversity.com (http://www.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.
Title: Re: How to contact Dave about doing a circuit for pay
Post by: timb on February 17, 2016, 01:27:25 am
Send me a pm, I do contract work. ;)
Title: Re: How to contact Dave about doing a circuit for pay
Post by: Mr 12 on February 17, 2016, 05:35:23 am
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 all


Audioguru I am not charging a battery to see it explode!
Title: Re: How to contact Dave about doing a circuit for pay
Post by: Psi on February 17, 2016, 06:37:30 am
I'm sure Dave would design your circuit, if you offered  $100,000
Title: Re: How to contact Dave about doing a circuit for pay
Post by: VK5RC on February 17, 2016, 07:47:37 am
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.
Title: Re: How to contact Dave about doing a circuit for pay
Post by: dadler on February 17, 2016, 08:16:52 am
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.