Jennings Electronic Industries (JEI) - Phaser
- Bernardduur
- Transistor Tuner
Yesterday this pedal came in the mail. I was fascinated by the origin (from the hands of the AC30 designers) but also wanted to hear it in action.
Fired up the unit has a HUGE volume boost with the phaser engaged or in bypass mode. It is not true bypass I suppose. The phaser has no LFO and can be used by rocking the pedal forwards and backwards. It can be activated the same way as a crybaby wah.
The sound is surprisingly nice. A very complex phaser sound that I was not expecting from it. Looking at the circuit it only has transistors, no IC can be found. (if I recall, I've never seen a pure transistor based phaser).
More pics will follow; I'll trace it when I got some spare time! http://www.hendrixguitars.com/Ef230.htm
http://www.effectsdatabase.com/model/je
Fired up the unit has a HUGE volume boost with the phaser engaged or in bypass mode. It is not true bypass I suppose. The phaser has no LFO and can be used by rocking the pedal forwards and backwards. It can be activated the same way as a crybaby wah.
The sound is surprisingly nice. A very complex phaser sound that I was not expecting from it. Looking at the circuit it only has transistors, no IC can be found. (if I recall, I've never seen a pure transistor based phaser).
More pics will follow; I'll trace it when I got some spare time! http://www.hendrixguitars.com/Ef230.htm
http://www.effectsdatabase.com/model/je
'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
- Fender3D
- Cap Cooler
The very first issue of Elektor in Italy, back in the late '70-early '80, featured a phaser circuit, it had two 1-transistor-phase stages (outputs on E and C) ala ***vibe, a dual gang pot instead of LDRs, I'm sorry but I don't recall what the input and input stages were...
- Bernardduur
- Transistor Tuner
Oops, forgot the univibe
That one is a pure transistor phaser
That one is a pure transistor phaser
'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
- Bernardduur
- Transistor Tuner
'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
- Bernardduur
- Transistor Tuner
'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
- Bernardduur
- Transistor Tuner
And the schematic!!
'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
- tube-exorcist
- Resistor Ronker
The original circuit can be found in Practical Electronics October 1973. The potentiometer should be alogarithmic type.
"I've noticed there's an inverse relationship between cost of gear and talent. If you need the most expensive gear to get decent tones, then you suck as a player."
- Bernardduur
- Transistor Tuner
Nice! I can't find that issue online; would you have one? I'm interested in the article....tube-exorcist wrote:The original circuit can be found in Practical Electronics October 1973. The potentiometer should be alogarithmic type.
'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
- tube-exorcist
- Resistor Ronker
Sorry, but I don´t have an original one - I found the article on Mar 24, 2001.... ONLINE. And yes, it is still there waiting for interested ones:Bernardduur wrote:Nice! I can't find that issue online; would you have one? I'm interested in the article....tube-exorcist wrote:The original circuit can be found in Practical Electronics October 1973. The potentiometer should be alogarithmic type.
http://www.synthdiy.com/show/?id=1118
(Download link at the the right bottom "pha.pdf".)
"I've noticed there's an inverse relationship between cost of gear and talent. If you need the most expensive gear to get decent tones, then you suck as a player."
- Manfred
- Tube Twister
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Hi Bernardduur,
thanks for dissectioning, great!
How is the size of the PCB?
Do you made a shot of the component side of the PCB too,
there are some components hidden by the plug sockets on the device shot?
I intend to create a replica PCB.
thanks for dissectioning, great!
How is the size of the PCB?
Do you made a shot of the component side of the PCB too,
there are some components hidden by the plug sockets on the device shot?
I intend to create a replica PCB.
- Fender3D
- Cap Cooler
lol
looking at the several magazines publishing(ed) this...
it may be a good argument for the "The Big Catfight: ethics/cloning/copying/stealing/personal" thread...
looking at the several magazines publishing(ed) this...
it may be a good argument for the "The Big Catfight: ethics/cloning/copying/stealing/personal" thread...
- Manfred
- Tube Twister
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I guess there is no argument, because it is a discontinued product since more than 40 years.Fender3D wrote:lol
looking at the several magazines publishing(ed) this...
it may be a good argument for the "The Big Catfight: ethics/cloning/copying/stealing/personal" thread...
Of course for noncommercial use only.
- Bernardduur
- Transistor Tuner
@ tube exorcist: Thanks for the link!!
@ Manfred: here ya go
Size: 7cm x 5.5cm
@ Manfred: here ya go
Size: 7cm x 5.5cm
'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
- Manfred
- Tube Twister
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Hi Bernardduur,
thanks for the shot and the board size.
thanks for the shot and the board size.
- Manfred
- Tube Twister
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I create the PCB layout clone according to the the shots.