What’s on *YOUR* workbench?

jwin615 said:
Are those 072 measurements in reference to input ground or with both prodes on the +- pins of the 072?
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I’ve taken the IC out, so measuring between both the power pins and and input ground.

It actually starts at +9v and drops over time to +1 - +0.6
Negative is steady at -17.7 which is higher than it should be, or lower or … you know what I mean!
 
LukeFRC said:
Sorry. I made something and it didn’t work
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No apple-pollywoggies me droogie, 'tis on your workbench, no?
This thread is about anything on our workbenches. So — ALL GOOD.

It was all in goo... I was just messin' 'round. When you see any of my posts, 90% of the time it's off-topic attempts at humour.
The "silly" clue in the post you quoted was "stupid-memes", as I was the one most recently posting a stupid-meme.



On the count of "filling threads with meaningless dribble..."
I plead guilty. May the court have mercy on me.
 
Luke, maybe something up with how you're filtering power to/from the charge-pump IC?
The drop seems like the big cap filling slowly up and then/or being drained slowly...

Sure you've got the correct pinout of the CP-IC?


Sorry, thrashing around in the deep end trying to pretend I can swim with the big trouble-shooting fish.
 
It works! Lack of connection between 9v pin on the charge pump and the D101 - must have damaged the trace somehow… solder bridge across and it’s working! Running at +-17.7v rather than 15 but nothing seems to be blowing up so we won’t complain!!

I’ll do a build report
 
LukeFRC said:
It works! Lack of connection between 9v pin on the charge pump and the D101 - must have damaged the trace somehow… solder bridge across and it’s working! Running at +-17.7v rather than 15 but nothing seems to be blowing up so we won’t complain!!

I’ll do a build report
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Occasionally happens in manufacturing. Nice job tracking it down.
 
I've been working on a little wave shaper that's an amalgamation of Escobedo's SSWSMS and precision rectifier (that you can dial in between half and full wave rectified)

Taken a little bit of work including finding out I had a dodgy batch of diodes AND a dead op-amp, and something real weird going on with the output buffer. With that being said with a sine input I can get triangle + square waves out, and the rectifier really opens up what you can do.

It's got a massive treble reduction that's happening somewhere in the circuit (that isn't just the AR gen), but aside from that does exactly what I had hoped it would do.

Sounds...very strange through a guitar. Square/triangle sounds exactly what you think it would sound like, half wave sounds like a ring mod (great with chords!) and full wave is your classic octave effect.
 
Did you know they make prototype board for SMD stuff? It's even double-sided. The holes all go to the ground plane on the back.

Here's today's prototype: a low power (long battery life) headphone amp. Puts out >0.1W into 16 ohms (that will blow both your ears and earbuds off!) and draws only 0.3mA at idle (in a mono version). The tradeoff is a bit more THD than a "HiFi" headphone amp -- whatever that is. Something like 0.25% at 16 ohms. Gets lower with higher Z headphones. Who cares though? It's meant for instruments, not audiophiles.

1747519699845.jpeg
 
I haven't been building pedals for a while (although I should fix one popping issue and do some bass modding at least), mainly because I wanted to get to know what I built a bit better.

And that turned into another whole music project using that pedal 👀

But at least the plan is to just shit out something without spending an eternity polishing it, so I get a good "excuse" to maybe learn a bit more about bass, practice music theory, write lyrics and maybe even sing for the first time on an actual song. I also have a drum programming course I'm working through I thought I'd practice here too.

Of course the thing is that writing the songs is the fun part, and the rest of it is a lot of work, and that's where a lot of projects falter, so we'll see... At least I'm trying to stick to 3 songs max.
 
drew.spriggs said:
I've been working on a little wave shaper that's an amalgamation of Escobedo's SSWSMS and precision rectifier (that you can dial in between half and full wave rectified)

Taken a little bit of work including finding out I had a dodgy batch of diodes AND a dead op-amp, and something real weird going on with the output buffer. With that being said with a sine input I can get triangle + square waves out, and the rectifier really opens up what you can do.

It's got a massive treble reduction that's happening somewhere in the circuit (that isn't just the AR gen), but aside from that does exactly what I had hoped it would do.

Sounds...very strange through a guitar. Square/triangle sounds exactly what you think it would sound like, half wave sounds like a ring mod (great with chords!) and full wave is your classic octave effect.
Click to expand...
Done!
 
My workbench is often virtual these days, but here's is what's on it anyway. Today's PCB. Looked cute enough that I sent it straight to JLCPCB without triple-checking, in a time-dishonoured tradition. I mean, what could possibly go wrong? 💥🔥🌪️


1747775978221.png Screenshot 2025-05-20 175846.png
 
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