[sdiy] inexpensive chips for oscillators (still learning...)

[Harry Bissell]

I'm assuming you want to make voltage controlled oscillators. The 7555 might be better for this.
The 4047 is usually used in fixed frequency oscillators...

H^) harry


----- Original Message -----
From: Bob K <farfisa5 at gmail.com>
To: synth-diy at dropmix.xs4all.nl
Sent: Mon, 26 Sep 2011 13:14:44 -0400 (EDT)
Subject: Re: [sdiy] inexpensive chips for oscillators (still learning...)

Oooh, and you can buy 25 4047 chips for under $10 and 25 7555's for
$13 from Digi-Key.

Okay, looks like I have some more research to do!

Thanks so far everyone!  I'm quite sure I'll be asking a lot more
questions in the future.

-Bob

On Mon, Sep 26, 2011 at 9:42 AM, Tom Wiltshire <tom at electricdruid.net> wrote:
>
> On 26 Sep 2011, at 17:21, Bob K wrote:
>
>> Hi everyone,
>>
>> New here.  Hi.  How's everybody?  Fine?  That's good.
>>
>> After skimming through the two Forrest Mimms books I have and "Make:
>> Electronics", both books are making a point that 555 and 556 chips are
>> a good (and cheap) start for breadboarding oscillators.
>>
>> I'm planning on a bulk purchase (bulk meaning around 10) of the above
>> mentioned chips and was wondering if there are any other cheap chips
>> along the lines of the 555 and 556 that can be used for oscillators?
>> I'm going to search online for advice as well but thought I'd run this
>> question by everybody here.
>>
>> Thanks.
>>
>> -Bob
>
> Hi Bob,
>
> I used to use the CMOS 4047 chip. For example:
>
> http://uk.farnell.com/texas-instruments/cd4047be/ic-4000-cmos-4047-dip14-18v/dp/1106105
>
> This chip runs the outputs through a flip-flop. This means you get a reliable 50/50 square wave all the time, which you can't say about the 555. Secondly, the oscillator output is also available on pin 13, so you've got another square wave an octave up.
>
> Regards,
> Tom
>
>
>
>
_______________________________________________
Synth-diy mailing list
Synth-diy at dropmix.xs4all.nl
http://dropmix.xs4all.nl/mailman/listinfo/synth-diy

-- 
Harry Bissell & Nora Abdullah 4eva