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I'll try to get something done in the next couple of days then!
The tac switches used in Line6 gear do have a degree of bounce but this is controlled in the DSP by software. Certain products were reworked prior to sale with revised code to improve the switch response by changing the bounce ratio. This made the switches fractionally slower to operate (barely perceptible) but a lot more reliable in operation.
Frank @jpfamps has taken the time to draw up a schematic for this and a BOM. I said I’d put it up on the forum to see if anyone else was interested in having a look. I’m going to have a go to see what it’s like but it would definitely need smd to make it viable for use in a 1590b. Using 3 optos would also make it much more expensive than the switching I use now which only uses 1. @ICBM @m_c @impmann
Component list 1 = OpFET (H11F1M) 2 = OpFET (H11F1M) 3 = OpFET (H11F1M) C1 = 4n7 C2 = 100p C3 = 220p C4 = 220p C5 = 100p C6 = 10n C7 = 4n7 D1 = 1N4148 D2 = 1N4148 J = 1/4" mono J = 1/4" mono LED1 = R1 = 390 R2 = 2M2 R5 = 1M R6 = 56k R7 = 100k R8 = 56k R9 = 56k R10 = 100k R11 = 56k R12 = 2M2 R13 = 1.2M R14 = 1M R15 = 100 R16 = 470 R17 = 4k7 S1 = T1 = T2 = T3 = T4 =
i am considering returning to a simpler setup on my pedalboard having eliminated my G2. I thought a simple 3dpt 4 loop looper would do the trick of omitting difficult or non true bypass pedals. I had considered the Gigrig qmx4 but worried that the relays may effect my vintage fuzz.
Any advice, please?
It would also explain how the switch status is occasionally remembered when you remove power, as it'll only take a slight parasitic charge on a couple of the capacitors to decide power on state. (C1, C2, C5, and C7 don't have anything to drain them to ground, unless you ground out VCC).
However, I would of thought there would be something in the circuit to bias it so it powers up in bypass mode. Unless I'm missing something, what side of the flip flop powers up first, is purely down to luck, unless you mis-match some of the transistors.
It's certainly fuelled an idea I have rolling around in my head at the moment.
The power on status will depend on the loading on the collectors of the flip flop transistors.
In my experience with the BOSS flip flop the loading means that the flip flop powers up in only one state rather than randomly, however the loading may need tweaking to ensure that this is the case as it (should) be equally loaded on each side, eg C2 and C3 can be varied.
This was in notes I sent with the schematic.