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Mad Bean Pedals Total Recall Quick Start Manual

Fx type: delay, based on the ehx deluxe memory man
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Total Recall
FX Type: Delay
Based on the EHX® Deluxe Memory Man™
© 2015 madbeanpedals
3.34" W x 3.875" H
Terms of Use: You are free to use purchased Total Recall circuit boards for both DIY
and small commercial operations. You may not offer Total Recall boards for resale or as
part of a "kit" in a commercial fashion. Peer to peer re-sale is, of course, okay

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Summary of Contents for Mad Bean Pedals Total Recall

  • Page 1 © 2015 madbeanpedals 3.34" W x 3.875" H Terms of Use: You are free to use purchased Total Recall circuit boards for both DIY and small commercial operations. You may not offer Total Recall boards for resale or as part of a “kit” in a commercial fashion. Peer to peer re-sale is, of course, okay...
  • Page 3 B.O.M. Resistors Resistors Caps Caps Diodes 100n 10uF 1N4751A 100k 27pF 1N4001 100k 47uF 100k 2u2 BP 4558 150R 240k 470n NE570 100k 180k 220n 4558 200k 330k 10uF 4558 200k 100n 4558 240pF 100n 470uF CD4047 100k 100n 4558 100k 10uF Regulator...

  • Page 4: Shopping List

    Shopping List Value Type Rating Value Type Rating Metal / Carbon Film 1/2W 27pF Ceramic 25v Min. 150R Metal / Carbon Film 1/4W 120pF Ceramic 25v Min. 240R 150pF Metal / Carbon Film Ceramic 25v Min. 470R 240pF Metal / Carbon Film 1/4W MLCC / Mica - 5% tolerance 25v Min.
  • Page 6 1590BB Tall Drill Guide 7.08" W x 8.1" T...
  • Page 7 Stock Wiring  Leave enough clearance between the wires and IC6 - IC8 so they do not pick up any clock signal.  The indicator LED can be soldered directly to the PCB.  If you are using the TRXPN board, refer to that documentation on how to install the expansion board properly. If not, be sure you jumper XS and XR pads together on the lower right of the TR PCB.
  • Page 8 True Bypass Wiring  Leave enough clearance between the wires and IC6 - IC8 so they do not pick up any clock signal.  The indicator LED can be soldered directly to the PCB.  If you are using the TRXPN board, refer to that documentation on how to install the expansion board properly. If not, be sure you jumper XS and XR pads together on the lower right of the TR PCB.
  • Page 9 At long last, the vintage Memory Man™ project is here! The Total Recall is a clone of the big box DMM which allows you to use either two MN3005 or four MN3008 (if you include the optional expansion board; the TRXPN). With the recent...
  • Page 10 Wiring You can wire the Total Recall in either stock or true-bypass fashion. In the stock wiring, the LEVEL control is always active and can be used to boost the bypass signal. Personally, I like this option as the circuit's higher voltage provides a nice clean boost at low LEVEL settings up to a mild overdrive at high settings.
  • Page 11 Biasing There are two ways to bias the Total Recall. One is by ear and the other is with an oscilloscope. This document will show you how to do it by ear. For scope biasing there are a few guides online the give lots of detail on how to do the procedure.
  • Page 12 The gain recovery stage starts at XR. It is fed through an inverted gain stage with a trimmer to adjust the output volume. Here the biasing is done differently with the bias voltage applied to the non-inverted input of the op-amp. At the outputs, we have a new trimmer, BAL.
  • Page 13  Now connect your audio probe to pin7 of IC4_B. Adjust GAIN1 until the volume output is approximately the same as the volume input on pin7 of IC6 (this balances the signal volumes between the two BBDs).  Disconnect the power supply from the circuit and install IC7. Reconnect the power supply. ...
  • Page 14 Voltages Using the EHX 24v supply measuring -34.68 / no load 4558 NE570 4558 4558 4558 -7.48 -13.74 -6.41 -7.48 -7.48 -7.48 -12.98 -3.21 -7.48 -7.48 -7.44 -12.99 -3.18 -7.44 -7.46 -14.82 -14.82 -14.82 -14.82 -14.82 -7.40 -13.00 -7.46 -7.43 -6.69 -7.48 -12.97...