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The TRXPN is an expansion board for the Total Recall project. It allows one to use four MN3008 BBDs in place of two
MN3005 (both totaling about 550ms of delay). The TRXPN has its own bias trimmers for the two added BBD stages and
when wired to the TR main board, they are inserted as stages 2 and 3 of the delay. This makes the exact sequence of
BBD stages as follows (referring to both the TR and TRXPN schematics):
IC6
BBD
D_IN
TR
Total Recall Expansion Board
© 2015 madbeanpedals
IC10
BBD
XS
TRXPN
TRXPN
1.8" H x 1.25" W
IC11
BBD
XR
TRXPN
IC4B
IC7
Gain
BBD
Recovery
TR
TR
IC4A
Gain
Recovery
D_OUT
TR
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Related Manuals for Mad Bean Pedals TRXPN
Summary of Contents for Mad Bean Pedals TRXPN
- Page 1 1.8" H x 1.25" W The TRXPN is an expansion board for the Total Recall project. It allows one to use four MN3008 BBDs in place of two MN3005 (both totaling about 550ms of delay). The TRXPN has its own bias trimmers for the two added BBD stages and when wired to the TR main board, they are inserted as stages 2 and 3 of the delay.
- Page 2 B.O.M. Shopping List Resistors Value QTY Type Rating Metal / Carbon Film 1/4W Metal / Carbon Film 1/4W Metal / Carbon Film 1/4W 100k Metal / Carbon Film 1/4W 100k Film 25v min. MN3008 100k Bourns 3362P 100k Caps IC10 IC11 Trimmers BIAS3...
- Page 3 You should use wires to connect the boards rather than straight-pin connectors. This will allow access to the trimmers underneath the TRXPN board when it is attached to the main board. To keep everything locked down, use a small blob of...
- Page 4 The calibration procedure for the TRXPN is the same as the one used for the Total Recall. I just requires a few added steps. This is the procedure in its entirety for both the TR and TRXPN boards. If you are using a scope for calibrating the Total Recall, refer the to link included the Total Recall document.