Modding a pedal to stay perma-on (for rehousing).
Hello all.
I have an old no-name (actually a MultiVox Big Jam) EQ pedal that I'm going to rehouse with some other stuff(a boss CE-2).
To keep the CE-2 'always on' I was told to remove one of the 2 bypassing transistors (Q6/Q5). I did that and it worked. The LED stays on now (haven't tested audio throughput yet).
The EQ pedal has a similar switching system (from looking at it), and it also has a pair of trannies bunched together facing opposite ways (like the boss pedal). It also bypasses like a boss pedal (a small spst momentary).
I tried removing one of the trannies but the LED still switched around (I didn't test audio though).
Is that 'pair of switching trannies' system common among alot of pedals,with the solution being to remove one of them?
The traces on the PCB like coming up so I'm hesitant to just keep trying random things, hence why I'm asking here.
Is there a chance that removing one of the trannys did in fact keep the pedal 'on' even though the LED would still change status?
If I can't find a way to just keep the pedal on, where should I look for a 'wet' signal to tap from for the output?
It's a 6band graphic eq, with with 3 4558 dual op-amps (I'm guessing 1 per channel). There's also 2 larger ICs, a MC14007UB(dual inverter) and a MC14011B(CMOS gate). The LED is being fed by the 4011 it seems.
There are also only 2 trannys on the board.
Thanks
I have an old no-name (actually a MultiVox Big Jam) EQ pedal that I'm going to rehouse with some other stuff(a boss CE-2).
To keep the CE-2 'always on' I was told to remove one of the 2 bypassing transistors (Q6/Q5). I did that and it worked. The LED stays on now (haven't tested audio throughput yet).
The EQ pedal has a similar switching system (from looking at it), and it also has a pair of trannies bunched together facing opposite ways (like the boss pedal). It also bypasses like a boss pedal (a small spst momentary).
I tried removing one of the trannies but the LED still switched around (I didn't test audio though).
Is that 'pair of switching trannies' system common among alot of pedals,with the solution being to remove one of them?
The traces on the PCB like coming up so I'm hesitant to just keep trying random things, hence why I'm asking here.
Is there a chance that removing one of the trannys did in fact keep the pedal 'on' even though the LED would still change status?
If I can't find a way to just keep the pedal on, where should I look for a 'wet' signal to tap from for the output?
It's a 6band graphic eq, with with 3 4558 dual op-amps (I'm guessing 1 per channel). There's also 2 larger ICs, a MC14007UB(dual inverter) and a MC14011B(CMOS gate). The LED is being fed by the 4011 it seems.
There are also only 2 trannys on the board.
Thanks
- frank.clarke
- Breadboard Brother
Information
If you have the schematic, you can locate the input and output of the circuit, and remove the electronic switching.
- analogguru
- Old Solderhand
Information
Normally the switching in the bigjam pedals is done with the 4007.
Have a look at the Pearl schematics to get an impression how it is done.
analogguru
Have a look at the Pearl schematics to get an impression how it is done.
analogguru
There´s a sucker born every minute - and too many of them end up in the bootweak pedal biz.