Author Topic: Benefits of having multiple Op amps?  (Read 1094 times)

twoheadedfetus

Benefits of having multiple Op amps?
« on: January 28, 2018, 11:41:02 AM »
I took apart an old computer speaker and found a jrc4558D inside, I wanted to build a simple distortion pedal and thought itd be cool to use it.
So far Ive only built a simple one op amp guitar amp using an lm386, and I really liked it actually, so im still almost a complete beginner.
Ive found out that the 4558 I have is a dual op amp, so id like to use both somehow if im gonna use it. What are some cool things I can do with two op amps that I cant with one? My original idea was just one op amp for gain and some hard clipping after it. What could I do with the second op amp?

potul

Re: Benefits of having multiple Op amps?
« Reply #1 on: March 19, 2018, 03:11:09 AM »
Most pedals based on the Tubescreamer are using 2 opamps. Go find one that appeals to you

More info on TS:

http://www.geofex.com/article_folders/tstech/tsxtech.htm

Transmogrifox

Re: Benefits of having multiple Op amps?
« Reply #2 on: March 28, 2018, 11:23:50 PM »
With some googling you can find several layouts and breadboard wiring diagrams.  The Tubescreamer is a good project for a 4558. 
trans·mog·ri·fy
tr.v. trans·mog·ri·fied, trans·mog·ri·fy·ing, trans·mog·ri·fies To change into a different shape or form, especially one that is fantastic or bizarre.

Benoi31

Re: Benefits of having multiple Op amps?
« Reply #3 on: June 10, 2018, 08:26:36 AM »
Actually most overdrives use two OP amp to reproduce the "preamp + master" sections of an amp. The first OP amp is used for clipping and the second one for volume adjustment.

A good exemple of that is of course the Tubescreamer, but the Marshall Bluesbreaker, Timmy/Jan Ray or the Boss DS1 use the same topology.

MaxPower

Re: Benefits of having multiple Op amps?
« Reply #4 on: July 17, 2018, 04:42:53 PM »
You can also use one op amp to build an active tone circuit. Something like a DOD 250 with tone controls.
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