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

[-NRRRRK-]

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My first contact-mic, a shaker-box and a dirt-simple white-noise-generator (has a little top-squeal, but that's ok).

[Soloman Tump]

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I finally moved house, and fabricated my new workbench.....

So now I can BUILD SHIT ON IT

Got a load of racks and shelves to put up, and a strip light to go on the wall.

[Indeterminacy]

A dedicated bench is a thing of beauty.
Carve the date and your initials in it.

[-NRRRRK-]

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Passive feedback-box, built from the schematic on this site:


Had all the parts needed anyway, it's a fun-built and after a first try I can say it is pretty useful. Got to add a little more modulation-pedals to the line-up though.

[Indeterminacy]

From the O3 generator post I made

These images show the plate behind the fan.
The pin prick of light is an arc burning through the plate.
This one has about 2000 hours of use.

The arc burned through and the plate said later.
Goddamnit.

[crochambeau]

The arc burned through and the plate said later.
Goddamnit.

Those fingers look like conductive paths etched/adhered/plated over a ceramic substrate. Am I close?

Would scratching off the arcing finger have extended the lifespan at reduced efficiency?

Some sort of thermal cut-off could also be employed, if this is a technology suited to forever usage. I wonder how hard that little plug-in module would be to fabricate.

[crochambeau]

Preamp based on the Jensen 918 discrete transistor operational amplifier.

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Some output trickery involving a "summed" math trace on the scope, transformer output on bottom, "direct" output on top, with math in the middle. The ringing you see on the transformer output is a resonance around 100 kHz due to complete lack of compensation. Frequency response holds to about 100 kHz, whereupon the transformer output climbs wildly for several thousand Hertz bandwidth before everything starts dropping off significantly in the 130 kHz region.

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Anyway, the unpopulated PCB is a DC to DC SMPS that will take a standard 9 volts and supply bipolar power in a region of my choosing. I think I'm going to go with +/- 18 volts on this one.

[timdrage]

Finally got round to figuring out the command line stuff I had to do to update my GBxCart and get it working again, so now can flash obscure music roms over cheap aliexpress fake gameboy carts once more

[FAP]

Demo vid coming soon

[FAP]

circuit bent Homedics Body Basics white noise machine
MODS:
-new paint job (pour painting)
-1/4” output (no more speaker)
-toggle pitch pot: between approx. 2x faster to 3.5x slower than stock resistor
-status LED (on/off)
-overdrive/distortion
-“chopper” effect: a hidden LED bridged between two nodes of the volume pot creates this odd repetitive pulse pattern that “chops” up the sound
-“purée” effect: sort of like a hi-pass filter, adds some flavors and subtracts others
-reset button
-pitch contacts: volatile experimental feature that opens the door to glitches and crashes, can only be initiated in the normal pitch mode but can be further controlled by the pitch pot and other parameters after initiation.

Will definitely change how I do pour painting from now on, including but not limited to:
-using a higher quality masking or painters tape that does a better job at sealing-off areas I don’t want to be painted
-keeping the amount of paint poured to a minimum, in order to avoid the fingernail-thick layer I ended up with here
-higher quality paints, or possibly a high quality sealant/fixative, to avoid paint peeling.

I did spray it with some primer before painting, though, and that shit worked amazing.

Pro tip: save painting (pour or spray or whatever) for LAST: solder every component and plan component layout beforehand, then test it to make sure it all works, mount the components as if you were going to seal the deal without a paint job, test again, the disassemble and carefully place somewhere you can get back to it later. Doing all this saves a lot of time and headaches when putting everything together: you’ve already done the bulk of the debugging so less time spent trying to solder shit in tight spaces or trying to diagnose dumb problems (though of course things can still go wrong even after triple-checked crossed Ts and dotted is).