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.
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.
The PCB is a small single-sided; I traced it pretty quickly. It has two HEF4069UBP by Philips and one Motorola MC14066BP (CD4066).Exar EF-1 Envelope Filter [schematic]
- VitaliiBobrov
- Breadboard Brother