Comments on: Rat http://gaussmarkov.net/wordpress/circuits/rat/ guitar stompboxes and electronics Thu, 17 May 2012 02:09:15 -0700 hourly 1 http://wordpress.org/?v=3.1 By: Simon http://gaussmarkov.net/wordpress/circuits/rat/comment-page-1/#comment-1620 Simon Sat, 24 Mar 2012 17:35:04 +0000 http://gaussmarkov.net/wordpress/circuits/rat/#comment-1620 I own a turbo-rat that I modded to a 'normal' one and it sounds just great. Just replace the LED's by two 1N4148 diodes! Anyway I just simulated this with LTspice and its real fun! I even noticed that you can use a 2N5457 instead of a 2N5458. Just in case someone needs a replacement type! LM741's are also OK, but i find LM308 sounds better but oh, thats just a simulation and my gusto... ;-) I own a turbo-rat that I modded to a ‘normal’ one and it sounds just great. Just replace the LED’s by two 1N4148 diodes!

Anyway I just simulated this with LTspice and its real fun! I even noticed that you can use a 2N5457 instead of a 2N5458. Just in case someone needs a replacement type!

LM741′s are also OK, but i find LM308 sounds better but oh, thats just a simulation and my gusto… ;-)

]]> By: Kodiak http://gaussmarkov.net/wordpress/circuits/rat/comment-page-1/#comment-1559 Kodiak Sat, 15 Oct 2011 10:55:26 +0000 http://gaussmarkov.net/wordpress/circuits/rat/#comment-1559 If i am right is the transistor Q1 wrong connected in the PCB, because the gate should be connected to the resistor R8. Assuming you are looking from above it is the drain which is connected to R8. But i have other problems. I only get a noise from the OPV. Input ( + and - ) and the output is in the static conndition nearly the half of V_cc so that should be right. Does anyone have an indea, where the failure can be? If i am right is the transistor Q1 wrong connected in the PCB, because the gate should be connected to the resistor R8.
Assuming you are looking from above it is the drain which is connected to R8.
But i have other problems. I only get a noise from the OPV. Input ( + and – ) and the output is in the static conndition nearly the half of V_cc so that should be right. Does anyone have an indea, where the failure can be?

]]> By: Leo http://gaussmarkov.net/wordpress/circuits/rat/comment-page-1/#comment-1553 Leo Thu, 29 Sep 2011 19:29:49 +0000 http://gaussmarkov.net/wordpress/circuits/rat/#comment-1553 Awesome and easy build, thanks Gauss! Awesome and easy build, thanks Gauss!

]]> By: bob http://gaussmarkov.net/wordpress/circuits/rat/comment-page-1/#comment-1541 bob Wed, 03 Aug 2011 09:21:36 +0000 http://gaussmarkov.net/wordpress/circuits/rat/#comment-1541 first time builder where do i put the negative of the battery clip first time builder where do i put
the negative of the battery clip

]]> By: nesar morgan http://gaussmarkov.net/wordpress/circuits/rat/comment-page-1/#comment-1471 nesar morgan Tue, 11 Jan 2011 22:00:06 +0000 http://gaussmarkov.net/wordpress/circuits/rat/#comment-1471 i ned voltages parts i ned voltages parts

]]> By: alfan http://gaussmarkov.net/wordpress/circuits/rat/comment-page-1/#comment-1292 alfan Tue, 23 Feb 2010 16:11:55 +0000 http://gaussmarkov.net/wordpress/circuits/rat/#comment-1292 ...continue from my older post. there's ringing or some artifact on my proco rat clone,its heard when i add the distortion,even only a bit. how to remove 'ringing'? thanks. …continue from my older post.

there’s ringing or some artifact on my proco rat clone,its heard when i add the distortion,even only a bit.

how to remove ‘ringing’? thanks.

]]> By: alfan http://gaussmarkov.net/wordpress/circuits/rat/comment-page-1/#comment-1291 alfan Tue, 23 Feb 2010 15:07:12 +0000 http://gaussmarkov.net/wordpress/circuits/rat/#comment-1291 hi gauss ... i just finish build the proco rat clone by this schematic.but why the distortion not clean as the original rat? i have the original rat too ...and by the A/B test the original rat has more smooth sound too. please help ...thanks. hi gauss …

i just finish build the proco rat clone by this schematic.but why the distortion not clean as the original rat? i have the original rat too …and by the A/B test the original rat has more smooth sound too.

please help …thanks.

]]> By: Facundo http://gaussmarkov.net/wordpress/circuits/rat/comment-page-1/#comment-1222 Facundo Mon, 02 Nov 2009 02:17:47 +0000 http://gaussmarkov.net/wordpress/circuits/rat/#comment-1222 Hello gaussmarkov / Paul, I have a question, I hope not to disturb. I want to remove the control "filter" the RAT and replace it with a tone control tri-band (bass-mid-trebble). my question is, what components should I remove? (100k potentiometer obviously = P) R7 (1.5k) c8 (0.0033uf) c9 (0.022uf) and r8 (1M) Or am I wrong? Thanks so much. Facundo from Argentina:) Hello gaussmarkov / Paul, I have a question, I hope not to disturb.
I want to remove the control “filter” the RAT and replace it with a tone control tri-band (bass-mid-trebble).

my question is, what components should I remove? (100k potentiometer obviously = P)
R7 (1.5k)
c8 (0.0033uf)
c9 (0.022uf)
and r8 (1M)
Or am I wrong?

Thanks so much.
Facundo from Argentina:)

]]> By: rob http://gaussmarkov.net/wordpress/circuits/rat/comment-page-1/#comment-1210 rob Tue, 20 Oct 2009 21:54:22 +0000 http://gaussmarkov.net/wordpress/circuits/rat/#comment-1210 yeah i 'll go along with that....ching chong chinaman....already built two.. yeah i ‘ll go along with that….ching chong chinaman….already built two..

]]> By: chingchongchinaman http://gaussmarkov.net/wordpress/circuits/rat/comment-page-1/#comment-1156 chingchongchinaman Wed, 24 Jun 2009 14:28:24 +0000 http://gaussmarkov.net/wordpress/circuits/rat/#comment-1156 no you must apply noodles to your fore head...this will resilt in much fortune in the pedal making department..... wise words for today.. man maketh pedal for no man is rich in his soul until he builds dr boogie... no you must apply noodles to your fore head…this will resilt in much fortune in the pedal making department…..

wise words for today..

man maketh pedal for no man is rich
in his soul until he builds dr boogie…

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