Emerson Custom Guitars E-M Drive. [traced]
- The Rotagilla
- Diode Debunker
I count two caps, two resistors and a transistor.
The television will not be revolutionized.
- soulsonic
- Old Solderhand
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I wonder why no battery?
"Analog electronics in music is dead. Analog effects pedal design is a dead art." - Fran
- The Rotagilla
- Diode Debunker
Because it would get in the way of those honkin' big caps?soulsonic wrote:I wonder why no battery?
Going green maybe? I've a couple pedals like that, battery snaps would be added upon request.
The television will not be revolutionized.
- sinner
- Old Solderhand
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Or solar powered?
Americans are getting nuts with ecology recently
Americans are getting nuts with ecology recently
- IvIark
- Tube Twister
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I see that as the Gain pot being in series with the input.
100n to base
2M from base to collector
4K7 from collector to supply
Emitter to ground
100n from collector to output.
Have I missed anything or does anyone see if differently?
100n to base
2M from base to collector
4K7 from collector to supply
Emitter to ground
100n from collector to output.
Have I missed anything or does anyone see if differently?
"If anyone is a 'genius' for putting jacks in such a pedal in the only spot where they could physically fit, then I assume I too am a genius for correctly inserting my legs into my pants this morning." - candletears7 - TGP
- IvIark
- Tube Twister
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I'd assumed the LED resistor was in that heat shrink wrap close to the LED
"If anyone is a 'genius' for putting jacks in such a pedal in the only spot where they could physically fit, then I assume I too am a genius for correctly inserting my legs into my pants this morning." - candletears7 - TGP
- phibes
- Transistor Tuner
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lulzsinner wrote:Or solar powered?
Americans are getting nuts with ecology recently
GuitarlCarl - "TGP = The Gear Polishers"
Ken
Ken
- Bernardduur
- Transistor Tuner
Those green caps are those green russian K42Y-2 caps; I have a couple of em. Are being sold on ebay as some fancy PIO caps....... I heard that the lesser voltage ones (150V) are not, only the higher voltages are
'No more....... loud music.......'
Follow my love for pedals and amps on https://bernardduur.blogspot.com and https://www.instagram.com/bernardduur1
Follow my love for pedals and amps on https://bernardduur.blogspot.com and https://www.instagram.com/bernardduur1
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I wonder what transistor they use. J201 maybe?
- caspercody
- Resistor Ronker
I do not think it is a Jfet. I think it is either a PNP, or MOSFET. Because, looking at the number one leg looks to be going to ground. On a PNP transistor this would be the emitter leg, and on a MOSFET this would be the source leg. On the J201 this would be the drain leg, and I am not good with designs but have not seen a J201 with the drain to ground. I found a better picture of the inside, and have attached. Love the sound of this and would love to see a schematic.
Thanks
Rob
Thanks
Rob
- IvIark
- Tube Twister
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I thought is was a 2N5088 (or similar pin out NPN) and so collector at the bottom with the orientation shown with the 4K7 next to it going from collector to supply. Top cap is the input cap to base, bottom cap is the output cap and so the 2M resistor would then logically be between collector and base. Then the track coming from the top pin to a single wire (emitter?) would be the only connection on the board which needed grounding and so that would make sense. Like this:
[scheme removed]
[scheme removed]
"If anyone is a 'genius' for putting jacks in such a pedal in the only spot where they could physically fit, then I assume I too am a genius for correctly inserting my legs into my pants this morning." - candletears7 - TGP
- caspercody
- Resistor Ronker
Here is what I can make out of the wiring. Not sure about some of the switch connections, but I am sure some of you here can make more sense of what is going on.
- Attachments
-
- WIRING.pdf
- (8.63 KiB) Downloaded 580 times
- caspercody
- Resistor Ronker
Bread boarded this it it works, but the distortion breaks up??
- Nocentelli
- Tube Twister
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I tend to use the words "distortion", "break-up", "overdrive", "clipping" etc interchangeably.... Do you mean the overdrive sound is unpleasant, gated, intermittent? A single transistor dirt circuit (with no clipping diodes etc) is rarely sophisticated: This looks vaguely similar to a bazzfuss, or an electra with the clipping diodes removed.
modman wrote: ↑ Let's hope it's not a hit, because soldering up the same pedal everyday, is a sad life. It's that same ole devilish double bind again...
- caspercody
- Resistor Ronker
gated would be a good way to describe it, like a badly biased JFET. On the decay of the notes it sounded bad. And the bass sound was really gated sounded. But the controls worked like in the video. Low gain high volume gave a clean boost, and high gain low volume was distortion.
- IvIark
- Tube Twister
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There could always be some components on the other side of the board.
"If anyone is a 'genius' for putting jacks in such a pedal in the only spot where they could physically fit, then I assume I too am a genius for correctly inserting my legs into my pants this morning." - candletears7 - TGP
- Nocentelli
- Tube Twister
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Maybe, but I'm inclined to think this is mainly aimed at driving the input of a nice tube amp rather than primarily producing the clipping from within the transistor itself. It's not that disimilar to the Naga Viper: The "Heat" control allows you to drive the transistor itself into clipping by increasing the gain via the emitter - Here, the transistor is already set at maximum gain via the grounded emitter, and the input level pot allows you to reduce the clipping within the transistor for a cleanish boost. The viper doersn't sound great with the heat cranked into a transistor amp, but I imagine the nastier characteristics of tranny clipping would be masked when using a nice tube amp that is in overdrive itself. The same might be the case here.
modman wrote: ↑ Let's hope it's not a hit, because soldering up the same pedal everyday, is a sad life. It's that same ole devilish double bind again...
I doubt if there's controls underneath. In the video from Mike Hermans I think the pedals sound great in the lower volume regions but I don't like how it breaks up/clips in the higher settings. Indeed an Electra like circuit without clipping diodes. But IMO this can also be done with a SHO or EP booster. I also don't think these mojo caps make loads of difference. But I'd love to hear your opinions about them.