Harley Benton/Chord/Beta Aivin Bass EQ BEQ-1 Guts

All about modern commercial stompbox circuits from Electro Harmonix over MXR, Boss and Ibanez into the nineties.
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NickS
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Post by NickS »

This metal box sells for under £30 and has the same old EQ bands as the Behringer and Boss boxes.
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The red dots on the sliders do not light up.
Test points underneath:
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Sliders are on a daughter-board that makes access to half the circuit tricky.
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The same board is used for the guitar version, active frequency bands listed for both.
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The op-amp used is the 4560. I'm sure there are lower-noise devices...jack sockets on boards.
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Input/output, flip-flop for soft switching, etc., I guess are under the daughter-board
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Capacitor mounting looks unexpectedly substandard.
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