Build Shit - DIY - What's On Your Bench?

[crochambeau]

Some year I would like to dig into some Haible circuits.

Meanwhile I'm busy doing the electronic equivalent of riding a bicycle wearing ass-less chaps.

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[FAP]

Preview of my next build, and thus far my most complex one by quite a large margin:

[logorok]

[Indeterminacy]

Nice.
For those in the studio audience, what does it do?

[logorok]

For those in the studio audience, what does it do?

The lower three are comparators. If your input voltage goes over a certain level (determined by the potentiometer) a gate is generated. This gives variable pulswiidht rectangles. Second picture.

If the level ist determined by the second input (first picture), output is crazy sounds in audio range or crazy rhythms in low frequency range.

[logorok]

Upper part is a voltage controlled divider. Serge stlye, schematics by Jürgen Haible.

[FAP]

3.5 months later…

Circuit bent Sunbeam Pest Repeller, featuring:
- volume control
- optional low pass filter controls, including an effect bypass accessible via 2 banana jacks on the left hand side (for external LFO use)
- 1/8” and 1/4” output options in addition to the native speaker (1/8” out is parent to 1/4” out)
- momentary mute button
- optional external LDR (photoresistor) control accessible via a 1/8” input that routes to two banana jacks on the right hand side
- 5 native “pest” buttons (only 2 of which are reasonably audible with the native speaker, but all of which are audible through either of the outputs)
- 2 native sound variations (the “R/C” switch on the front)
- 6 controllable parameters [that do different things], each with at least 2 patch points (banana jacks), a toggle switch and a pot/knob
- 4 of the 6 parameters have a disconnect option for external LDR or other uses via their patch points
- optional power starve
- 24 additional patch points mounted on the top
- 5 patch points to ground (GND)

This has to be my most ambitious bend to date and it shows.

Videos coming soon.

[FAP]

[FAP]

Matters of far greater importance in my personal/professional life have diverted a significant amount of my time and efforts away from building things (though it’s ultimately for the best).
I have one more major build leftover from last year I plan on showing off eventually, as well as a recent repair, but for now I’d like to share a current work in progress:

Caveman-tier testing jig I cobbled together for my next circuit bending project. The silver box (top) houses a 12v power supply (I.e. 2xAA+1x9v) and a volume pot circuit, connected to the unit’s PCB (below) via a screw terminal bay (middle). A quick and dirty setup, but makes testing things way easier.

[FAP]

As promised, here's the last major build I did for 2021: The "Cute 'lil 555ker."


Triple-555 circuit:
- 2 x vactrol LFOs (square waves) w/ on/off switches
- 1 x oscillator
Additional features:
- status LED
- on/off switch
- three primary knobs: tone, frequency, volume
- switched output w/ built-in speaker
- two knobs to control LFOs: one for tone, one for frequency
- two switches to toggle LFO knob AND primary knob on/off: one for tone, one for frequency
- tone variation switch: variation off with momentary on button, or variation on with momentary off button
- recycled enclosure from a crappy USB (+bluetooth?) speaker
- recycled switches for LFOs
- salvaged neon green knobs

TL;DR three 555s and a few recycled parts slapped-together to create a tone generator + gritty motorbike noise machine.

Partially based on a schematic I found in a RadioShack electronics kit; here's the whole schematic (albeit drawn in a somewhat confusing way):

And a detail of the volume pot schematic (based on a video by elohess2):

Here's what it looks like currently: