Added various utility circuits to the “Other” category of vero layouts.

CMOS switching circuit that can be used to route an input to the input of either of three different circuits:

+9v DC regulated power supply unit. Can be updated for +18v by changing to capacitors rated 25v+ and a +18v regulator:

A standard charge pump circuit that can give you -9v. Use either alone (for those positive ground effects) or in conjunction with the +9v for bi-polar power:

A voltage doubler using either the 7660S or the MAX1044 IC. This will give you almost +18v from a +9v supply:

Same as the above voltage doubler (+9v to ~+18v), but using a higher current IC (the LT1054):

Outputs a 1000Hz sine wave with a user variable amplitude. Use for injecting a test signal when debugging:

JFET testing circuit. I used this to match transistors for the Phase 90:

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11 thoughts on “Misc utility circuits

  1. Hi Tom,

    It’s not part of the voltage doubler circuit, but rather a helper component. It’s a crude voltage inversion protection meant to save your circuit in case of a reverse voltage would accidentally be applied. If you look at most guitar effect schematics you’ll find some variant of this; it’s a cheap insurance that has no impact on the circuit when correct power i applied.

  2. Hi,

    For the LT1054-based voltage doubler, what is the purpose of D3? It does not appear in the TI datasheet.

    I’m a bit new to all this 🙂

  3. I believe, off the top of my head, that the 1054 has 10x the current capability, but do check the datasheets to be sure. For those effects you might get away with using a 1044. Typical dirt effects use much less power than stuff like delay and chorus etc.

  4. Looking at 18v doubler. When you say higher current, how much difference is there between max1044 version and lt1054 version. I want to put multiple effects in one box.
    Simple optical Compressor, clean boost, choice of fuzz – big muff/tone bender, tone stack, finally a blend. I wanted to use 18v on boost and fuzz to add headroom. 9v everywhere else. Do you think Max1044 will do?

  5. Hi, I’m building Okko Diablo at this moment and i want to put there charge pump with switch, I’m rookie at this stuff and i don’t know where to connect this switch 🙁 I have 2 position spst.

  6. The audio oscillator is great! Works just fine, makes a beautiful sine wave. It’s nice to see what all the pedals do to the wave form. Thanks!

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