Exar EF-1 Envelope Filter  [schematic]

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

I'm continuing to trace Exar pedals from my collection. This time it's FL-1 Enveloper filter. I have 2 of them, both made in 1993. I traced the one with the worse cosmetical condition because its paint was very fragile. The nicer one is on photos, with the box, warranty card, and instructions.
Exar FL-1 with box
Exar FL-1 with box
Exar FL-1 instructions
Exar FL-1 instructions
Exar FL-1 warranty card
Exar FL-1 warranty card
The PCB is a small single-sided; I traced it pretty quickly. It has two HEF4069UBP by Philips and one Motorola MC14066BP (CD4066).
Exar FL-1 PCB
Exar FL-1 PCB
It appeared to be an almost 1:1 clone of the vintage MXR Envelope Filter with input/output buffers added and some values replaced with the closest they have on hand (ex. 62k5 instead of 62k or two 10M resistors in series instead of one 22M). Attached is a schematic with buffered bypass switching parts omitted.
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exar-ef-1-schematic.pdf
Exar FL-1 schematic
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