Odp: Odp: [sdiy] ic question

[Roman Sowa]

----- Original Message -----
From: Brock Russell <brockr0 at shaw.ca>
To: synth-diy <synth-diy at dropmix.xs4all.nl>
Sent: Sunday, November 24, 2002 10:31 PM
Subject: Re: Odp: [sdiy] ic question


> >this 3909 generator can be replaced with any oscillator.
>
> I'm not sure this is true. The 3909 is driving an 8 ohm
speaker
> directly and most oscillators would have some trouble with
this.
> Not that I would suggest using the 3909. It is obsolete,
(although
> readily available from many surplus dealers), noisy and
sucks a
> lot of power in this configuration.

Right, 8 ohm is no good for CMOS. In that case one could
replace
output NOT gate with LM386 power amp or any other high
output
opamp. Or maybe a pair of transistors would do.

Roman