[sdiy] 2164 overvoltage condition?

[Tom Wiltshire]

Don't let them put you off, Sean!

I've breadboarded a lot of circuits with the 2164. It *is* a chip you have to be careful with, but I've only fried a couple in nearly ten years. That's not so bad! I've fried more PICs than that, but I probably wasn't so careful with them (cheaper =  more abuse!).

I've got V2164s in the shop, and we post to Australia (from Portugal), but something more local ought to arrive quicker.

http://electricdruid.net/product/v2164-quad-vca/

HTH,
Tom

==================
       Electric Druid
Synth & Stompbox DIY
==================



On 27 Jun 2017, at 05:53, rsdio at audiobanshee.com wrote:

> With breadboards, there is also the potential for ESD since you're handling wires directly. The human body can generate tens of thousands of Volts and easily fry a chip that's not protected by soldered-in circuit connections.
> 
> David's last email is probably describing exactly what happened: (nearly) infinite current input due to lack of a current-limiting resistor in series with the input.
> 
> Brian
> 
> 
> On Jun 26, 2017, at 9:27 PM, David G Dixon <dixon at mail.ubc.ca> wrote:
>> The 2164 is very fussy about power connections.  If you only connect one rail, it dies.  If you fail to connect the ground, it dies.  And it dies permanently.
>> 
>> This is probably why I almost never breadboard.  Once I figure I've got the circuit right, I just make a PCB.  I prefer the security of soldered connections, and it's no harder to lay out a PCB than to plan out a breadboard.  Also, since I typically don't make any layout mistakes, I usually end up with a usable board straightaway, without all that pesky breadboarding nonsense.
>> 
>> From: Sean Ellis
>>> I've been breadboarding a filter and oscillator using a single 2164 and I think I just fried my only 2164 on hand. I have the power supply protected but accidentally put -12 straight into the input of one amp (the control pin was at about 2.5V) and suddenly it died. The datasheet specifies the max ratings to the supply rails so I don't get why it could have (seemingly) destroyed the chip. Could it maybe have caused excessive heat?
>> 
> 
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