Recent content by Chuck D. Bones

With Mouser, you're guaranteed a legit part. I bought some on AliExpress and much to my surprise, they work great. 10 for about 3 bucks. Just to clarify, this is how I test 'em. Connect DMM across R2. Plus lead to +9V and minus lead to pin 4.

Those H11F1 numbers are so far off that it can't be a real H11F1. Might as well leave it out since the effect of the H11F1 is subtle when it's working right. $4 or $5 for a real LM308H sounds too good to be true. As a point of reference, I bought a large quantity of real LM308H last year and...

Did you run any tests to verify that the LM308Hs are legit? I seriously doubt that JAMECO did. There are no factory authorized sources for out-of-productions parts, which means there is no traceability. No paper trail from you back to the manufacturer. They are a popular item to counterfeit...

LM308 test Build this circuit on a breadboard: LM308 pin 2 to pin 6. pin 3 to gnd via 100K. Pin 3 to +9V via 100K. Pin 4 to GND. Pin 7 thru a DMM set to measure μA to +9V. Apply power and measure current into pin 7. Typical current draw is 300μA. I have measured as low at 250μA and as high as...

Oh, come on Steve, it wasn't THAT funny. :rolleyes:

First of all, JAMECO has not been a reputable supplier for at least the last decade. Search JAMECO in these forums and you will see many legitimate complaints about (the lack of) quality and customer service. While it's possible that JAMECO has recently reversed their business model, I'll...

I expect that Szukalski will "like" that one.

Sweet! I found that I could get a decent UniVibe throb with the standard cap values and the right COLOUR & DEPTH settings.

With the Feedback enabled, the distortion and gain are lower (unless GAIN is dimed), but the effect of the Tone controls is reduced as well.

Sweet! The circuit is 99% true to the Catalinbread WIIO. I just added the feedback (GEAR) switch.

So we can expect a demo from you in the near future. ;)

That's good.

Voltages look good. Try tweaking the bias by ear, might cure the fizz. Also check Q2-B & Q2-C. Q2-C should be higher, but with Ge for Q3, sometimes it's not.

For me, the warbling is a key part of the sound. Here's a challenge: replace the pots with LDRs and play it like a Theremin.