Here it is:
(http://www.hoho.cz/osobni/zdroj.jpg)
it should feed:
1. Univibe: +19.5V, +15V, 120mA (ish)
2. VOX Treble Booster, Input Buffer: +9V, 10mA
3. Rangemaster, Fuzz Face: -9V, 10mA
Also, can i distribute the voltages (from the source pictured above) this way?
(http://www.hoho.cz/osobni/rozvod.jpg)
If it was me I'd power the 7809 from the +19.5V node, not from the regulated 15V supply. But I think it'll work either way.
Looks ok to me.
you're right, it's better to take it from the 19.5V node. :)
How confident are you in the output voltage of the transformer if you have an AC source that is 10% to 20% lower? That is something that you have to expect as I have many times seen 90 volts on a 120 volt supply here in the states. :o
hmm, when the primary voltage goes down to let's say 207VAC (10% of 230VAC - by the way there is 220 on the pictures because i am just used to that number, it has been 230 for some years :)) i am getting something like 2X13VAC on the secondary , which means 18VDC on the smoothing capacitor.... would this affect the LFO circuit?
Quote from: yeeshkul on January 20, 2008, 03:21:54 AM
which means 18VDC on the smoothing capacitor.... would this affect the LFO circuit?
well it is gonna be more probably 16.8V.
just out of interest why are you running the Univibe's LFO at a different voltage to the rest of the circuit? Couldn't you just run it all at 15 or 18 volts?
The LFO circuit apparently needs about 20VDC, the signal processing just 15VDC.
The R.G's layout has DC input for 15VAC RMS(= about 20VDC peek on the 1mF cap) or 20VDC wall-wart (then you can skip the diode bridge) followed by 7815 to lower the voltage to 15V.
Using the supply above i don't need the DC source fixed on the Neovibe board. This is not any sort of funky attempt to improve the Neovibe design as it brilliant the way it is ;D. I just wanna run more effect from one supply. That's why all the mess.
That makes sense, I thought it was some sort of mod you had done.
You could use a bigger transformer maybe 2x18 or 2x20 and then use an LM337 adjustable regulator to give you a regulated 19.5 or 20 volts DC for the LFO part rather than just using the raw DC.
man you're right indeed, but that wouldn't fit the case i've been saving for my first pedal board hahaha.
Where is the 7909 available? I've not seen it from any of the big distributors or places that I usually shop for parts... I usually resort to an LM337 for negative supplies, but the 7909 would be nice to have for some things.