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I've pre-ordered a few of them from CabinTech Global to try out. After reviewing the datasheet and comparing to other 8-pin DIP BBDs, they are not pin-for-pin compatible. So a new layout would be needed. Considering the SSI2100's power requirements, I do see that it might be possible to create...

That price is available only in quantities of 1,000. :( $4.73 in singles at CabinTech Global (discounts for quantities).

If it has a built-in clock, why does it have a Clock pin (pin #8)?

Some good, clear photos may help too.

In your "Change 3" image, that diagram does not show a ground going to the main PCB.

Have you been reading any material on the FV-1 or SpinCAD? I recommend this link for a more focused look at the Pitch Shift block. And the only reference I have for pitch control is this chart . . . Considering the FV-1 has a pitch limit of 1.2 octaves down and a max of 2.0 octave up, I use...

Open the patch in SpinCAD, right-click on the pitch block and select "Control Panel" Therein are the settings that can be adjusted.

By the description of the problem(s), it sounds like an intermittent connection. I'd reflow EVERYTHING and give it another go. If it still goes wonky, put it on the bench and test the voltages for the +9V and +3.3V supplies and lines.

Yes. Use the 33pF (C4) cap. No. Using the 33pF cap does NOT have a negative impact on the sound. It's part of the circuit design and used in most every Rat build.

Nice! I take it the bypass doubles as a Rate indicator?

If I'm not mistaken, the +18V and +15V are the unloaded PS values. With the loads applied, the voltages work within the design parameters of the circuits' design and components. I'd stick with the BOM and designated component values to avoid any issues.

You need to swap the middle two green & black wire on the stompswitch PCB. You have them backwards.

The wattage rating limitation is also dependent on the current draw of the circuit. For circuits that draw just few mA, ⅛W is fine. Ohm's Law math will get you actual limits.

30 positions won't work. The FV-1 requires 8 or less.

Ack! You guys are right. Thanks for the catch. I copied/pasted the wrong part number when responding. Ive edited my original response to correct.

The MC1439 should sub nicely for the NJM5534D. The only significant difference between them is that the NJM5534 has a Slew-Rate of 13V/µs with a BJT (low impedance) input while the MC1439 has a Slew-Rate of 6V/µs with a BJT (low impedance) input. The difference is not retable by the human ear...

I do not have a sample drawing. The site I posted above has some SpinCAD file example links on it and you should be able to open those directly into SpinCAD. Do the reading. Nothing replaces that. ;)

You cannot get ±3 octaves with an FV-1. At best you can get about -1.2 octaves and +2 octaves. I suggest playing with each block's settings. By clicking on a placed block, you see a dropdown that shows any options for that block. Several have a "Settings" option that you can explore. There is...

AI transistor radio design. I believe our jobs/hobbies are safe for the time being. Thank you AI!

Try these two patches. They were created in SpinCAD 10.42 You can tweak them to suit your tastes. Pitch_Oct_Up_Dn.spcd Pitch_Oct_Up_Dn_02.spcd