Can you check my power supply design please?

[yeeshkul]

Here it is:


it should feed:
1. Univibe: +19.5V, +15V, 120mA  (ish)
2. VOX Treble Booster, Input Buffer: +9V, 10mA
3. Rangemaster, Fuzz Face: -9V, 10mA

[yeeshkul]

Also, can i distribute the voltages (from the source pictured above) this way?

[Ardric]

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.

[yeeshkul]

you're right, it's better to take it from the 19.5V node.

[Sir H C]

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.   

[yeeshkul]

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?

[yeeshkul]

which means 18VDC on the smoothing capacitor.... would this affect the LFO circuit?

well it is gonna be more probably 16.8V.

[slacker]

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?

[yeeshkul]

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 . I just wanna run more effect from one supply. That's why all the mess.

[slacker]

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.

[yeeshkul]

man you're right indeed, but that wouldn't fit the case i've been saving for my first pedal board hahaha.

[PerroGrande]

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.