| Author |
 Topic  |
|
|
Dirk
Platinum Member
Netherlands
1309 Posts |
 Posted - 12/12/2008 : 21:33:37
|
I want to convert my PH-1r to PSA powering, but how do I figure out which diode and resistor I should replace with jumpers?
Any help will be greatly appreciated 
Edit: Looking at the schematic, am I correct that it is the pair between points 6 and 7? |
Edited by - Dirk on 12/12/2008 21:40:22 |
|
|
Laurie
Double Platinum Member
Canada
4854 Posts |
Posted - 12/13/2008 : 00:07:52
|
| Exactly right! Two approaches - leave the diode/rersistor in place and take a small piece of wire and bridge from 6 to 7. More elegant, unsolder the diode and resistor and replace with wire links. |
 |
|
|
ChristoMephisto
Platinum Member
Canada
1288 Posts |
Posted - 12/13/2008 : 00:09:01
|
| Yeppers, those are the ones |
|
|
|
Dirk
Platinum Member
Netherlands
1309 Posts |
Posted - 12/13/2008 : 11:45:04
|
| Okay, thanks. |
|
|
|
Dirk
Platinum Member
Netherlands
1309 Posts |
Posted - 12/14/2008 : 16:30:18
|
A little update.
I shorted pins 6 and 7 taking the diode/resistor pair out of the circuit just like Laurie said.
It's a fine pedal with guitar, but with bass I noticed some high end loss, so this little mod brings some more voltage into the circuit increasing the headroom and adding clarity. Off course when used with a 12volt power supply like an old ACA adaptor.
This works miracles, there's still some distortion but I kind of like that, it adds to the sound.
So far, I found the best sound with the RES control at MIN, approaching the old PH-1 sound I guess.
I turn up the Depth to 12 o'clock and set Rate at 9/10 o'clock for a cool slow swoosh when playing steady 8 note rhythms.
Or turn up the Rate to 2/3 o'clock for a nice leslie effect.
Btw, this is probably the best demo video of an antique Roland Jet Phaser ever:
http://www.youtube.com/watch?v=q2w0dbTy2v8&feature=related |
|
|
| |
Topic |
|
ACA to PSA conversion, which resistor and diode?
