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61
Building your own stompbox / Re: Yellow humper correct schematic
« Last post by aron on Yesterday at 02:03:22 AM »
The purple peaker was my secret weapon with a Pignose 150R. I put it in the effects loop and it sounded great!
62
Building your own stompbox / Re: Yellow humper correct schematic
« Last post by Rob Strand on Yesterday at 02:01:08 AM »
I found a photo of a WD-era Yellow Humper which I strongly suspect (based on previously trying to work out the PCB layout of a Purple Peaker) has two 1M resistors in the locations where the 470Ks would go according to the schematic (the two that are nearest to the viewer):



Otherwise, visible resistor values seem to be as per the schematic (15K, 33K, a couple of 39Ks, a 150K on the right side where I suspect the input to be). Not a whole lot to go on, but a bit more grist for the mill.

(Oh and that Purple Peaker PCB appeared to have BC183LCs rather than 2SA666s, for what it's worth...)
Good digging.

So maybe the WD version is different and they put the 1M's in there to reduce the flatness issue.
Apparently there are differences between the Musitronics, Re-Issues and WD's;  Re-Issue maybe closer to WD's.
The electrolytic capacitor dates are 1994 which would be OK for WD's.   

I saw a unit with BC183's and small 1/8W resistors.  At first I thought it was a DIY clone but maybe it was a WD era unit.

The typical gains on the BC183LC are quite high, so perhaps another tweak.
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Building your own stompbox / Re: Aion Theseus (KoT) issues
« Last post by Rob Strand on Yesterday at 01:52:08 AM »
IC 1 reads:

IC1
Pin 1: 8.12v
Pin 2: 2.40v
Pin 3: 2.30v
Pin 4: 0v
Pin 5: 1.99v
Pin 6: 2.00v
Pin 7: 1.96v
Pin 8: 8.61v
To me the part of the circuit around pin 5, 6, 7 seems to be working and that VB would appear to be at 2.0V.
The weird thing the pin 3 is greater than 2.0V.  When the DMM loads down pin 3 you would
expect the pin 3 voltage to be less than 2.0V.   Then there's the question what is making VB low.
Only the 1M (R1) around the circuit involving IC1 pin 1, 2,3 connects to VB and R1 cannot make VB pull
down to 2V.

So there's two problem:  why is VB 2V and how can pin 3 get greater than 2V.
One possibility is IC1 is fried.

Maybe check your soldering on IC1 and check for shorts on the board.
64
Building your own stompbox / Re: Score...again.!
« Last post by glops on Yesterday at 01:46:20 AM »


in a page of photos, any chance of a pic of those caps?

Pretty much like Monoís pic but PRR hit the nail on the end. Most of the film caps in the Mallory drawers are of the orange chicklet flavor. Tons of 68NF and 150NFs (super happy for these as 150NF is a value Iíve almost never had on hand when needed) in orange and then I also discovered a drawer of 56NF which appear to be a more raspberry flavor.
65
Building your own stompbox / Re: Yellow humper correct schematic
« Last post by pacealot on Yesterday at 01:43:54 AM »
I found a photo of a WD-era Yellow Humper which I strongly suspect (based on previously trying to work out the PCB layout of a Purple Peaker) has two 1M resistors in the locations where the 470Ks would go according to the schematic (the two that are nearest to the viewer):



Otherwise, visible resistor values seem to be as per the schematic (15K, 33K, a couple of 39Ks, a 150K on the right side where I suspect the input to be). Not a whole lot to go on, but a bit more grist for the mill.

(Oh and that Purple Peaker PCB appeared to have BC183LCs rather than 2SA666s, for what it's worth...)
66
Building your own stompbox / Logic chip, flip flop, or relay?
« Last post by Matthew Sanford on Yesterday at 01:39:22 AM »
So, almost done with home repairs, and wanting to get back to it. Iíve been playing with a PT Wobble type thing, but want to switch between a StompFLO and One Shot. 4 CVs and the LFO to switch. First I was thinking NPNs instead of FETs in an extended flip flop, was worried about the voltage level changing (or would common base work?), then thinking a 74hc157, maybe flipping relaysÖ?

I figured relays would keep the signals the same better than the others, but havenít had time to play with any of itÖon the other hand,





Iím almost done with the house, so itís just been running round my head. Any pros or cons to each method? Iím figuring the 157/relay way would be lowest part count.
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Why do you need to fill in six checkpoints for each post here?
Choose words, write letters? It's inconvenient.
it will pass with time.
68
Why do you need to fill in six checkpoints for each post here?
Choose words, write letters? It's inconvenient.


Thank you. I will look for this resource.
69
Building your own stompbox / Re: Old telephone ringer stompbox
« Last post by SeneX225 on May 31, 2023, 11:10:52 PM »
A Ling ?

Chuck Berry - My Ding A Ling (1972)

The man refined and developed rhythm and blues for 70 years, and he is remembered for singing a dumb ditty about his wee-wee. (This was his only #1 hit, and next-to-last top 40.)

much much longer version

I always knew there is a connection between weiner songs and R'n'B.
70
Building your own stompbox / Re: Old telephone ringer stompbox
« Last post by Rob Strand on May 31, 2023, 09:53:38 PM »
A Ling ?

Chuck Berry - My Ding A Ling (1972)

The man refined and developed rhythm and blues for 70 years, and he is remembered for singing a dumb ditty about his wee-wee. (This was his only #1 hit, and next-to-last top 40.)

much much longer version
Did he play through speakers with Whizzer cones?
https://www.google.com.au/search?q=%2B%22whizzer+cone%22&source=lnms&tbm=isch&sa=X&ved=2ahUKEwj9_-2N-6D_AhUa7TgGHWPMAdQQ_AUoAXoECAEQAw&biw=1280&bih=899&dpr=1
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