Cgs synth

>
> Message: 1
> Date: Thu, 10 Mar 2005 08:49:19 +1100
> From: sasami@...
> Subject: Re: Wave Multiplier
>
> Hi,
>
> Serge used 4558 from memory, and yes, the waveforms are all "soft". Earler
> experiments I did were harder edged. There are other quad op-amps that are
> even faster than the TL074, though I forget the number off hand.
>
> Ken

Hi Gentlemen!

You might have success with this part TLE2144CN I've been experimenting with
them lately. It's a high-speed DIP Opamp that is TL074 pin-for-pin
compatible from Texas Instruments.

(They're about five times the price of a TL074)

www.mouser.com part number 595-TLE2144CN

Best Wishes!

Cynthia

>
>> Hi Ken,
>>
>> Just a quick question regarding the Wavemultiplier. I was
>> breadboarding it up last night, and I found that the pulse out
>> quickly turns to a triangle wave as the frequency is increased.
>>
>> The 'scope reveals that this is due to slew rate limiting of the
>> LM324 as it tries to crash from rail to rail at only 0.5V/uS. I'm
>> just curious; is this by design to mimic what the original Serge unit
>> did?
>>
>> I intend to put a TL074 in for IC4 which has a better slew rate of
>> 13V/uS and sharpen up those edges. I'll also attenuate the output as
>> +/-15V is a bit hot :-0
>>
>> Fun Circuit, but I must admit I haven't listened to it yet. Lots of
>> pretty pictures on the 'scope tho'.
>>
>> All the best
>>
>> Andy
>> ---
>>
>> Andy Wilson
>> http://www.techman.synth.net
>> andy@...

Hi Cynthia,

On 10 Mar 2005 at 8:18, Cynthia Webster wrote:

>
> You might have success with this part TLE2144CN I've been
> experimenting with
> them lately. It's a high-speed DIP Opamp that is TL074 pin-for-pin
> compatible from Texas Instruments.
>
> (They're about five times the price of a TL074)

Thanks for the tip. I must say, I'm not particularly worried about
using the fastest possible amp, and after putting in a TL074, I'm
quite happy with the waveshape coming out now.

In fact, I'm eying up that spare amp on IC2d which I still have as an
LM324, and I think I'll put a switch in to select between 'hard' and
'soft' pulse output. :->)

Cheers

Andy
---

Andy Wilson
http://www.techman.synth.net
andy@...