Odp: [sdiy] ic question

[Roman Sowa]

Why would anyone want to use 2 decoders and 4016s if there's
4051 that can replace those 4 chips?

this 3909 generator can be replaced with any oscillator.
Simplest
would be made of one schmit gate and capacitor. Resistor
(pot)
adjusting frequency would be connected via switching 4051.
And you could use another scmit gate from same chip for
tempo
control, i.e. U1 replacement. Plus you need 1000s times less
power
to run such circuit than original. Mail me if you need exact
drawing.

This only my suggestion tho...

Roman

----- Original Message -----
From: Rude 66 <r.lekx at chello.nl>
To: synthDIY <synth-diy at dropmix.xs4all.nl>
Sent: Sunday, November 24, 2002 12:16 PM
Subject: [sdiy] ic question


> good morning,
>
> i have an ic question. i'd like to build this:
>
> http://www.aaroncake.net/circuits/music.htm
>
> but i'm having trouble finding some parts in the conrad
catalogue.
>
> is the 3909 LED Flasher/Oscillator as an lm3914 n
led-modulator? i can't
> find the 3909 listed, is this a common part?
>
> same with the 7445 BCD To Decimal Decoder. is this the
same as an sn7445 n?
> or is there a compatible chip?
>
> thanks!
>
> ruud
>
>
>