[volt-nuts] DAS-46 CSA repair - fixed
Randy Evans
randyevans2688 at gmail.com
Mon Feb 13 21:48:29 EST 2017
Jerry,
I have a DAS-46 that I picked up but have yet to work on it. I would like
to get a copy of the LTSpice chopper model that you developed.
Thanks,
Randy Evans
randyevans2688 at gmail.com
On Mon, Feb 13, 2017 at 4:57 PM, Jerry Hancock <jerry at hanler.com> wrote:
> Hello, again all:
>
> Interesting thing happened today as the MFE3002 FETs showed up. You
> might remember I was using the NTE/ECG 220 knock offs. I plugged them
> into the board tightly and I wasn’t able to zero it. I then put the ECG
> knockoffs back in and they zeroed. I thought, what the heck, I paid for
> them, so I put the MFE3002 back in this time reversing them as the board
> uses two. The risk in touching these is they are very, very static
> sensitive. It then zeroed with the devices reversed. The circuit must be
> sensitive to the gate or base voltage somehow. I don’t know, but it zeroed
> so I soldered them in and the board is working fine now. It zeros and the
> +/- (normal/reverse) voltages are balanced.
>
> I can now say I am the expert on the DAS-46, DAS-47 and 57 CSA assembly!
>
> Again, if anyone wants to play with the chopper model in LTSpice, please
> drop me a note. I am adding part numbers where available, etc. This will
> make it easy for those knuckleheads that follow me. Now I know why they
> wanted $400 plus 10 weeks for another one!
>
> Jerry
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