simple noise generator with VCA

[elektrouwe]

just breadboarded this as part for a Lunetta style drum synth. But it contains nothing digital, so I didn't post it in the Lunetta forum

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[gabbagabi]

Hello ElektroUwe,
i guess u have a negative cv response with the npn transistor.
more cv results in less resistance in the transistor --> less voltage drop over the transistor.
cheers bb
gabbagabi

[elektrouwe]

[gabbagabi]

then there is nothing left to say then:congratulations!
this seems then a very pretty circuit,
by definition on the "to remember" list.

do u think bc560 bc547 will do the job also?

thx 4 sharing and
cheers
bb
gabbagabi

[elektrouwe]

thanks for the flowers gabbagabi
noise is like "Unkraut", so I guess the circuit is very tolerant in terms of component types and values that's why I took the next best 3 R values which are for sure not optimized . 100uF for the Cs is quite big, but I wanted some low frequency rumble. Any NPN with B>250 should be ok for a decent noise amplitude.
cheers, u~

[zaphod betamax]

Nice circuit. I slightly modified it for 5V supply by lowering the resistances
on the collectors.

I also added a AC coupled CD4069 amplifier.

Well done, and great work!

[zaphod betamax]

Here is the circuit

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ANALOGUE NOISE FOR 5Vdc.pdf
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Filename:	ANALOGUE NOISE FOR 5Vdc.pdf
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ANALOGUE NOISE FOR 5Vdc.pdf
Description:		Download (listen)
Filename:	ANALOGUE NOISE FOR 5Vdc.pdf
Filesize:	14.14 KB
Downloaded:	178 Time(s)

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