>Hi Gentlemen!
> 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
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@...