Roland AP-7 Whoa!
- Thread starter EZS
- Start date
ICTRock
Well-known member
"Obviously the size is a setback to DIY ... the 8 matched jfets (2sk30) would keep some at bay as well but near as I can tell there's no magic dust or fairy wings within. Someone right now wants this in a 125B and they are wrong."
I can't believe I have to quote myself
EZS
Well-known member
I see these are still available for a pretty reasonable low cost. But things are drying up by the day.
EZS
Well-known member
search found it was actually: Ram's Head Big Muff combined with a Maestro Phaser
Bricksnbeatles
Member known well
I’ve heard that this is what was used on Hot Chocolate’s “You Sexy Thing”
KR Sound
Well-known member
2SK208 seems to have identical properties and are
2SK30ATM data sheet
2SK208 data sheet
I love this pedal and might start a separate thread to work on the development of it. Goal of fitting it into a 1590BB would be cool.
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Feral Feline
Well-known member
If it can be 1590BB, please let it be vertical.
Otherwise, next side up, I'm good with a horizontal 1590XX.
Bricksnbeatles
Member known well
Link isn’t working, but when I search for the 2SK208 on mouser, they come up at 47¢ each, no moq, with a quantity discount to 21¢ each for 100.
KR Sound
Well-known member
Ya, typos all over the place. 20 cents for 100, not 2. Dur.
t1redhands
Active member
I'm using 2SK208-Y in a 4-stage phaser and they work very well. Specs are super close for easy matching and they're fairly cheap. Testing SMD JFETs is a bit tricky so it's a good thing tolerances are very close.
KR Sound
Well-known member
I was thinking about getting the Peak SOT23 tester for those. Seems like it would make that a bit easier. Guess it wouldn't be too hard to make a little pcb and just hold the smd in place.
Attachments
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Robert
Reverse Engineer
The SOT23 socket can be a bit annoying to use, especially when trying to measure a LOT of transistors back to back.
They seem to always flip over upside down or standing upright in some weird position and if it's not sitting just right the lid will bend the leads when you close it.
KR Sound
Well-known member
Looks like it would be like herding fleas. I'm going to make and order some little testers to easily hook the probes on or put some pins on to attach and just hold the thing in place while you push the button. Seems easy enough.
Fama
Well-known member
I wonder if a "two stacked PCB's" could be a decent low cost solution, maybe some holes for... string? So they line up. Or maybe you could just solder the two PCB's together or something.
The upper one has just one SOT-23 sized hole, lower one has the pads at correct locations. Flop the SMD part in the right way around, maybe push it gently to measure, flip the whole thing to get it out.
Ehh, it probably wouldn't work that well.
DGWVI
Well-known member
When Dead End Fx makes an SMD JFET adapter board
KR Sound
Well-known member
Ah yes, so that it drops right into place. That's actually a good idea!
I don't know how to do mouse bites or whatever, but something like this where the right part sits on top of the left and you can connect them with the 4 solder points.
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