Mmh, can´t find the 2N3908 transistor at any standard supplier I usually order from. Maybe s.o. could give me a tipp here? I´m located in Germany. Thx.a lot. _________________ --
How may I be of disservice?
---
Music for conscious listening @ http://www.fmdelight.de/
Mmh, can´t find the 2N3908 transistor at any standard supplier I usually order from. Maybe s.o. could give me a tipp here? I´m located in Germany. Thx.a lot.
Is this a substitute to the 08 or have I missed s.th.?
...
[edit]
Doooh! Thx for opening my eyes. It HAS to be the 2N3906. _________________ --
How may I be of disservice?
---
Music for conscious listening @ http://www.fmdelight.de/
i found that one could improve the range of potentiometer P4 by connecting the CCW (pin1) via a 10k to GND.
if you use the module for audio in the first place, you could even solder a 100k resistor across CW and wiper (pins 3 & 2) of the potentiometers (P3 & P4).
tommi wrote:
Why am I always late for fonik PCB offers?
I 'll go with stripboard as usual...
sorry. _________________
cheers,
matthias
____________
Big Boss at fonitronik
Tech Buddy at Random*Source
i found that one could improve the range of potentiometer P4 by connecting the CCW (pin1) via a 10k to GND.
if you use the module for audio in the first place, you could even solder a 100k resistor across CW and wiper (pins 3 & 2) of the potentiometers (P3 & P4).
i found that one could improve the range of potentiometer P4 by connecting the CCW (pin1) via a 10k to GND.
if you use the module for audio in the first place, you could even solder a 100k resistor across CW and wiper (pins 3 & 2) of the potentiometers (P3 & P4).
Thanks. I'll add these little changes on the stripboard!
It would have been easy adding these changes to the PCB too
true. however, you actually could do these changes off board at the potentiometers. _________________
cheers,
matthias
____________
Big Boss at fonitronik
Tech Buddy at Random*Source
true. however, you actually could do these changes off board at the potentiometers.
Not to be honest, because I choosed to use pcb mounted pots. I choose that way to reduce the number of cables running from the board to the panel mounted components for a cleaner build
Anyway I'll put those resistors on the board.
But I planned to mount R3,4,7 and 8 on the jacks and this will make the stripboard less crowded (and less deep). _________________ http://soundcloud.com/mister-vommi http://tideofsound.net
I got my stripboard version working now! I posted pictures on the 2010 build thread. After some troubleshooting due to brutal mistakes, such as forgetting one resistance and putting all trannies backwards (!). Watching fonik's pcb i realized that 2n3906's pinout is the opposite of what i decided it was..
I am not sure about how to calibrate this module.
I don't have a scope so i just followed the procedure told by fonik on page 7:
-with no signal applied and all pots down exept for carrier initial wich is fully up, I turn the trim (T1) until i got 0V at TP1.
The same procedure for the modulator signal.
So in both cases i got 0V at Test Point when the 'initial' pot is fully up and about - 1,2V when that pot is fully down. Is that ok?
There is some bleedthru between channels when i mixed two audio signals.
When i mix two DC signals (i tried with CV out from a sequencer and a sine wave from an lfo), bleedthru (from lfo's sine) is much more evident.
I am not sure if my calibration is ok and just wanted to share my experience..
cheers _________________ http://soundcloud.com/mister-vommi http://tideofsound.net
So in both cases i got 0V at Test Point when the 'initial' pot is fully up and about - 1,2V when that pot is fully down. Is that ok?
There is some bleedthru between channels when i mixed two audio signals.
When i mix two DC signals (i tried with CV out from a sequencer and a sine wave from an lfo), bleedthru (from lfo's sine) is much more evident.
all is okay, even the bleedthrough. you cannot expect VCA action from this design anyways... _________________
cheers,
matthias
____________
Big Boss at fonitronik
Tech Buddy at Random*Source
you cannot expect VCA action from this design anyways...
That's right! Anyway this module have its own character and me too i was hit by the demo of kkissinger!
Any suggestion about some interesting patch that modulates two DC signals?
cheers _________________ http://soundcloud.com/mister-vommi http://tideofsound.net
Joined: Nov 22, 2009 Posts: 667 Location: Frederick, MD
Posted: Tue Feb 01, 2011 3:34 pm Post subject:
Yep, desolder pump is your friend. Best purchase I've made for DIY (next to a somewhat decent soldering station). Desolder pumps can be a bit of a pain--you've got to keep them cleaned out--but they're WAY better than desoldering braid. Less potentially damaging as well. _________________ Looking for a certain ratio since 1978
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