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Cgs synth

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Re: CGS38: Do the 600K have to be 1/4W or is 1/8W sufficient?

2012-03-28 by Joachim

OK, looks like that was a stupid question. Forgot about Ohm's law.
Thanks that you answered regardless of that.

Cheers
Joachim

Am 28.03.2012 21:22, schrieb Ove Ridé:
> On 28 March 2012 20:32, Joachim<sonicwarrior@...> wrote:
>> Hi,
>>
>> as I didn't yet get an answer regarding the ASM-1 mod for the CGS48 I started
>> soldering my CGS38 instead. Then I stumbled across the 600K resistors
>> (btw. the two 100n 1206SMT are missing in the parts list):
>>
>> Is 1/8W sufficient for these? Because then I could use Mouser no. 71-RN55D-F-600K for these.
>>
>> (If I really need 600K for the ASM-1 mod of the CGS48, too, it would be interesting if I could
>> you them there also)
>
> As a general rule of thumb, hardly any current will flow through these
> high value resistors in a low voltage circuit like synth circuit. If
> in doubt, imagine the worst case scenario where the resistor is
> connected between the voltage rails. You can do this calculation
> easily with Google:
>
> (30 volts)^2/(600 kiloohms)
>
> This ends up being 0.0015 watts, so about 10 times lower than the
> rated wattage. Of course, under most circumstances, a resistor in a
> circuit will be connected in a way that makes the current much lower
> than this theoretical maximum.
>

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