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Messages - Robusto

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1
Latest Update:


2
I got the 8038 on eBay from here:

https://www.ebay.com/itm/2PCS-INTERSIL-ICL8038CCPD-ICL8038-Waveform-Generator-Oscill-Gen-DIP-14-IC-New/291565457594?ssPageName=STRK%3AMEBIDX%3AIT&_trksid=p2057872.m2749.l2649

Looks like they're still in business with a 99.8% rating, although the top review says "Counterfeit ICís all 5 where bad. Replaced with another vendors product all work
5PCS National Semiconductor LF351N LF351 JFET Input Op-Amp and Machined"
Sooooooooo.....hmmm. I bought two of them and have tried both.

I got the AD633 from Mouser.

Sounds like maybe the 8038? Would be nice to have one from a legit source. Does anyone besides Small Bear sell them?

Thanks for the reply!

3
Ok, nothing? Here’s some more:

I reseated all the ICs. I changed out the shift and mod pots for new, as the first ones I used had been salvaged from a previous project. I started tracing with an audio probe and started getting an effect signal all the way to the end. I plug a guitar into it and I am getting effected signal, but the pots have no effect. The signal stays the same no matter which way I turn them.

Annoying.

4
Hey all,

As the title says, I finished the Freekout, and when engaged, I'm getting a boosted signal but no modulation. I can hear the whine of the generator, and it goes up and down if I adjust the pots, but no effected signal.

Checked all the part values, I don't see any solder bridges, here's the voltages:

Input 18.06V
Trim 50%
Pots all fully clockwise

IC1
683mV
35mV
35mV
-14.46V
38mV
38mV
38mV
14.37V

IC2
-1.3mV
.58mV
-16.5mV
.58mV
-14.5V
4.1mV
0
14.87V

IC3
8.8V
7.38V
7.49V
11.76V
11.75V
14.87V
11.7V
11.7V
7.8V
7.53V
.56mV
5.64mV
_
1mV

IC4
0
1.3mV
0
-14.5V
2mV
2mV
2mV
14.87V

IC5
-14.49V
-6mV
-4.9mV
-14.5V
-14.5V
-4mV
14.87V
_

IC6
1.9V
7.97V
.7mV
-6.64V
-14.5V
2.5V
1.4V
14.8V

REG
17.74V
.36mV
14.87V








5
General Questions / Odd Current Lover output issue
« on: December 24, 2019, 12:06:43 PM »
Hello,

Finished the Current Lover recently. Worked great unboxed. After I boxed it, the effected part of the signal went away. So just clean signal with the effect engaged. After some messing around, I discovered that there is some issue with the in/out jacks. The problem is happening when the jacks are installed in the box. If i unscrew them and hang them off the side of the box, the effect comes back. I've tried different jacks. This enclosure is unpainted. Am I grounding/shorting the board with the jacks touching the metal? It doesn't seem to make a lot of sense. I thought about trying to cover/paint the inner edges of the holes for the jacks, but what would I use? Thanks!

6
Mods / Re: Current lover - Rate LED?
« on: December 10, 2019, 08:06:04 AM »
Not sure if i should make a new thread for this or bring this one back from the dead, so I'll start here. I just finished the Current Lover, and my rate LED only blinks when the pot is almost fully clockwise. From 0%-95%, it stays solid. Do I need to experiment with the value of R36 maybe? The clock trim? Has this issue ever been reported before?

Thanks!

7
General Questions / Current Lover question
« on: November 29, 2019, 01:35:37 PM »
Loved building this, and it actually worked the first time I plugged it in!

Question: as I am adjusting bias, around the mid-point there's a ton of distortion. Is this normal? I have to set the bias trim to 100% to get flange, and it's still kinda noisy. Is there a chip i should try swapping out to see if that makes a difference? I bought my BBD from Small Bear, so should be legit.

If anyone has any tips, let me know.

Thanks!

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