Mad Bean Pedals TRXPN Manual de usuario

TRXPN

Total Recall Expansion Board

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. This makes the exact sequence of

BBD stages as follows (referring to both the TR and TRXPN schematics):

IC6

BBD

IC10

BBD

TRXPN

IC11

BBD

TRXPN

IC4B

Gain

Recovery

IC7

BBD

D_IN XS XR D_OUT

IC4A

Gain

Recovery

alue QTY Type Rating

R62 6k8 2k4 4 Metal / Carbon Film 1/4W

R63 82k 6k8 2 Metal / Carbon Film 1/4W

R64 2k4 82k 2 Metal / Carbon Film 1/4W

R65 2k4 100k 2 Metal / Carbon Film 1/4W

R66 100k 1uF 2 Film 25v min.

R67 6k8 BBD 2 MN3008

R68 82k 100k 2 Bourns 3362P

R69 2k4

R70 2k4

R71 100k

C47 1uF

C48 1uF

IC10 BBD

IC11 BBD

BIAS3 100k

BIAS4 100k

Trimmers

B.O.M. Shopping List

Resistors

Caps

Wiring

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

Blue Tac or double-sided foam tape under the TRPXN when you have it all boxed up.

Biasing and Calibration

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. This method is "ear calibration" only, which is what most

builders will likely use.

Procedure

Tools required: audio source, audio probe.

To begin, make sure you have wired the TRXPN board to the Total Recall board. Install all ICs except IC7, IC10 and

IC11. We will bias one BBD at a time. Set your controls as follows:

DELAY - full up

FDBK - a little less than halfway up

MOD - all the way down

LEVEL - about 1/3rd up

BLEND - doesn't matter (you should leave the circuit output disconnected since we will be audio probing)

CH/VB switch - doesn't matter

Leave all the trimmers in their halfway position to start.

 Connect the TR PCB to your power supply. Use an audio source at the input of the circuit (J1). While you can just

strum your guitar it might be difficult to make trimmer adjustments at the same time. If you have a looper, record a

few single notes a few seconds apart and feed that into the circuit. Or, improvise with something else.

 Connect your audio probe to either pin3 or pin4 of IC6. Now adjust BIAS1 until you hear delay output. Adjust

BIAS1 further until you find the min and max settings where you have clean delay output. Set BIAS1 to

approximately the middle point of this range. Now make very small adjustments left and right until you find the

spot where the delay output is cleanest and strongest.

 Disconnect the power and install IC10 to the TRXPN board. Reconnect power and repeat the same biasing

procedure done above using the BIAS3 trimmer on the TRXPN board and pins 3/4 of IC10.

 Disconnect the power again and install IC11. Repeat the same procedure with BIAS4 and pins 3/4 of IC11.

 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.

 Connect your audio probe to pin3 or 4 of IC7. Do the same type of adjustment to BIAS2 to get clean delay output.

 Re-connect your audio probe to pin7 of IC4_B. Make any adjustments needed to GAIN1 to reach the same

volume output you had before. This part is a bit of fine tuning between GAIN1 and BIAS2 to get the optimal result.

 Leave the BAL trimmer in the middle position. Connect your audio probe to pin1 of IC4_A. Adjust the GAIN2

trimmer until the output is the same or slightly above the volume input of pin7 on IC6.

 You are done!

For voltages, refer to the list in the Total Recall build document. You should have about the same readings on IC10 and

IC11 as you have for IC6/7.

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