Mad Bean Pedals Total Recall, Quick Start Manual

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.



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!

If you are using the BBD expansion board, refer to that documentation on how to do this procedure with four BBDs. It is 
generally the same thing with a few added steps. 

Mouser Cart 

For convenience, I have created a cart in Mouser that includes most of the items in the BOM. All the items highlighted in 
blue are in the cart in the correct quantities. Items in yellow are not included in the cart. Caveat: I have not personally 
ordered this cart. It was made using my "best guess" on the parts I would order for this project. 

http://www.mouser.com/ProjectManager/ProjectDetail.aspx?AccessID=16a26046e1

Also, 

this cart does not include the quantities needed for the TRXPN

 board. However, those parts and values are 

already listed in the Mouser cart. Simply put in the additional quantities needed for the resistors, caps and trimmers for the 
TRXPN board.