Minimoog D Pitch Bend modification (solved)
- RL
- Posts: 759
- Joined: Wed May 19, 2004 4:17 am
- Location: http://www.moogmusic.de/
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Re: Minimoog D Pitch Bend modification
BTW, the voltage on the wiper of the pitch bend pot and ground should be around +4.3 Volts when the wheel is in the center position. Before this measuring make sure that there's zero Volt on the diodes.
http://www.moogmusic.de/index2
Re: Minimoog D Pitch Bend modification
hello guys,
I didn't get your messages before tuning the minimoog, I've managed to tune it (but in fact it was already in tune except osc 3 that had the zero position slightly wrong, and while trying to change that i messed everything up as I was following old board guides, while having a new board, which I didn't know )
Before that I had set the trimpot of the Pitch Wheel mod so that the zero position have the notes played in tune on OSC 1 with the Tune button to zero.
Now I'm going to measure diodes to get the zero band mod working, it's not right now.
RL you say:
BTW, the voltage on the wiper of the pitch bend pot and ground should be around +4.3 Volts
what is a wiper ?
thanks!
I didn't get your messages before tuning the minimoog, I've managed to tune it (but in fact it was already in tune except osc 3 that had the zero position slightly wrong, and while trying to change that i messed everything up as I was following old board guides, while having a new board, which I didn't know )
Before that I had set the trimpot of the Pitch Wheel mod so that the zero position have the notes played in tune on OSC 1 with the Tune button to zero.
Now I'm going to measure diodes to get the zero band mod working, it's not right now.
RL you say:
BTW, the voltage on the wiper of the pitch bend pot and ground should be around +4.3 Volts
what is a wiper ?
thanks!
- RL
- Posts: 759
- Joined: Wed May 19, 2004 4:17 am
- Location: http://www.moogmusic.de/
- Contact:
Re: Minimoog D Pitch Bend modification
The wiper is the middle pin of the pitch bend pot (usually orange colored). The ground pin is usually the white wire of the pitch bend pot.chris j wrote:what is a wiper ?
http://www.moogmusic.de/index2
Re: Minimoog D Pitch Bend modification
OK thanks Rudy!
mesuring between wiper and ground I get 6.8V
and zeroV on the diodes.
so that means, I have to set the pitch wheel's zero point to 4.3V, then set the trimpot so that the diodes still show 0 V ?
mesuring between wiper and ground I get 6.8V
and zeroV on the diodes.
so that means, I have to set the pitch wheel's zero point to 4.3V, then set the trimpot so that the diodes still show 0 V ?
- RL
- Posts: 759
- Joined: Wed May 19, 2004 4:17 am
- Location: http://www.moogmusic.de/
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Re: Minimoog D Pitch Bend modification
Correctchris j wrote:so that means, I have to set the pitch wheel's zero point to 4.3V, then set the trimpot so that the diodes still show 0 V ?
http://www.moogmusic.de/index2
Re: Minimoog D Pitch Bend modification
I've set the center position of the pitch wheel to 4.3V, then set the trim pot to be in tune, but there's still no zero band, I've been turning the trimpot very VERY slowly to see if the zero band was somewhere near, while touching the pitch wheel but it still goes out of tune in big jumps of +/- 30 cents whenever I just put my finger on the wheel.
thanks for the help!
thanks for the help!
Last edited by chris j on Wed Jun 19, 2013 5:26 pm, edited 1 time in total.
- RL
- Posts: 759
- Joined: Wed May 19, 2004 4:17 am
- Location: http://www.moogmusic.de/
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Re: Minimoog D Pitch Bend modification
Hi Chris,
do you know who installed the modification?
do you know who installed the modification?
http://www.moogmusic.de/index2
Re: Minimoog D Pitch Bend modification
No I have no idea, the guy that sold it me didn't know what it was.
I've been measuring the diodes, I get 0.1V whatever the position of the trimpot is, i go full circle and the diodes V values don't change
I've been measuring the diodes, I get 0.1V whatever the position of the trimpot is, i go full circle and the diodes V values don't change
- RL
- Posts: 759
- Joined: Wed May 19, 2004 4:17 am
- Location: http://www.moogmusic.de/
- Contact:
Re: Minimoog D Pitch Bend modification
Hi Chris,
is the circuit on the small PCB like this circuit?
is the circuit on the small PCB like this circuit?
http://www.moogmusic.de/index2
Re: Minimoog D Pitch Bend modification
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Last edited by chris j on Wed Jun 19, 2013 5:30 pm, edited 1 time in total.
Re: Minimoog D Pitch Bend modification
Hi RL (and everyone), I've been trying to understand your circuit (I'm lost with VCC's meaning)
Last edited by chris j on Wed Jun 19, 2013 5:27 pm, edited 1 time in total.
Re: Minimoog D Pitch Bend modification
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Last edited by chris j on Wed Jun 19, 2013 5:30 pm, edited 2 times in total.
Re: Minimoog D Pitch Bend modification
I looked at RL's picture, and I'll solder the 3 wires (red, orange and beige) the way they are on the pic.
Re: Minimoog D Pitch Bend modification
bypassed the modification and set the pitch wheel to be in tune, I get 4.6V between the wiper and the ground.
Last edited by chris j on Wed Jun 19, 2013 5:29 pm, edited 1 time in total.
- thealien666
- Posts: 2791
- Joined: Mon Nov 14, 2011 8:42 pm
- Location: Quebec, Canada
Re: Minimoog D Pitch Bend modification
Just for your info, VCC is the positive power supply. In the case of the Minimoog it is +10 Volts DC.
Moog Minimoog D (1975)
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Alesis Ion