[sdiy] Difficult 2164 behaviour between different sections.

Tom Bugs admin at bugbrand.co.uk
Mon Jul 15 16:57:33 CEST 2019


I didn't exactly - I rejigged things so that different sections were 
used for the critical parts.

Best, Tom

On 14/07/2019 21:05, Erik Dower wrote:
> Hi Tom,
>
> Did you ever resolve this issue? Unfortunately I find myself in a similar situation.
>
> Thanks,
>
> epk
>
>> On May 30, 2018, at 10:29 PM, Tom Bugs <admin at bugbrand.co.uk> wrote:
>>
>> Thanks all.
>>
>> Beefing up the 0V is something I tried on another point of the circuit, but I don't think I tried it on the 0V pin itself - good point!
>>
>> I will try Rbias some more for sure.
>>
>> And agree with many of the points from David - it has been an eye opener & I will have a few more deep sessions with it.
>>
>> I'll report back..
>>
>> Cheers - Tom
>>
>>
>> On 30/05/2018 19:41, David G Dixon wrote:
>>> That's an excellent idea.  I was thinking something similar, because if
>>> there is any external impedance at that pin, then those control inputs are
>>> going to interact because of those internal 5k impedances.  That's probably
>>> the issue -- your ground isn't really ground.
>>>
>>>> -----Original Message-----
>>>> From: Synth-diy [mailto:synth-diy-bounces at synth-diy.org] On
>>>> Behalf Of Oakley Sound
>>>> Sent: Wednesday, May 30, 2018 9:11 AM
>>>> To: Synth DIY
>>>> Subject: Re: [sdiy] Difficult 2164 behaviour between
>>>> different sections.
>>>>
>>>> It could well be internal to the 2164 but have you tried
>>>> lowering the the resistance to the 0V pin? Temporarily cludge
>>>> a ruddy big wire from the PSU's 0V directly to pin 8, in
>>>> parallel with what you've already got on the board, and see
>>>> what happens.
>>>>
>>>> Tony
>>>>
>>>> www.oakleysound.com
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