I was looking at this again
http://www.generalguitargadgets.com/pdf/ggg_20x0_amp.pdf
and just now saw that it is designed for 9v. I was planning on running it at 18, should I? And if so, what changes do I need to make?

Also, suggestions for a bipolar power supply schematic to use? There is a lot of stuff out there to choose from.

I have access to all the tools and (free!) material I need for making the chassis and I am comfortable working with mains voltage for the power supply.
I plan on building the GGG TDA on either Perf or Vero, currently undecided. when I do I'll post a layout her for verification.
I would normaly go the route of "garage sale special" but the unique reqrirement for this amp in terms of size make that difficult. I have access to almost unlimited free plywood and THICK steel stud, so materiel for the cab and chassis will not be a factor. I know how to work with it as well.

Thanks for all the help!

It is a dpdt switch, meaning that depending on the position of the switch, you are running either into the headphone jack or your speaker.
I n my layout, toggle switch down means headphone jack, up means speaker.

Very nice, I love the look of that Maxi-Rubber. An idea for you headphone jack:

Quote from: J M Fahey on April 03, 2009, 08:04:35 PM
preferably with 2 x 4700x25; 4x 1N5404 or a 4 amp bridge and a 12+12V, 2,5 or 3A transformer . Good luck.

Forgive my newbhood, but I did not get any of that.
If I understand you up to this point, this
http://www.generalguitargadgets.com/pdf/ggg_bipolar_ps.pdf
does NOT have the power to handle a chip amp, and I need a new power supply. Is there any way you can point me to a solid schematic for one that would work for me?

Will this work for the amp section though?
http://www.generalguitargadgets.com/pdf/ggg_20x0_amp.pdf

My goal is a stereo amp, though. Two pre amps into two power amps into two speakers.  I figure I can cheat a bit and have the power amps use the same power supply, but having two separate amps going simultaneously is the #1 goal (#2 is economy).

Quote from: J M Fahey on April 03, 2009, 12:07:42 AM
The one posted is "pedal size" and will explode driving power amps. Good luck.

I assume you are talking about the bipolar power supply, correct?
I looked at the HCR30 Laney, but it seems a bit over my head. I all I need is a power supply, can't I fine one isolated?

Quote from: J M Fahey on April 03, 2009, 12:07:42 AM
2)Are 30W (which you're *not* getting now) enough for a Jazz Band ?, considering that for Jazz you usually can´t go beyond 50% of your clean power on grounds of dynamic range.

I think it will be plenty. when I first started playing with them I was using a Fender Frontman 15 with an 8" speaker, and it was almost loud enough.

Thanks for all the help guys!

Well, I need an amp for my college jazz band. I always wanted a Roland JC, even before I played much jazz I thought they had the best clean tone ever. I have an idea vaguely sort of similar to the JC, two totally separate amps each running into a separate speaker, each voiced a little differently for a nice stereo effect. I came across this
http://eu.st.com/stonline/products/literature/ds/1459/tda2030a.pdf
and my tentative plan is to build two poweramp sections with these, using something like this
http://www.runoffgroove.com/tonemender.html
for each of the two preamps.

I found these, will they work for what I want to build?
http://www.generalguitargadgets.com/pdf/ggg_20x0_amp.pdf
http://www.generalguitargadgets.com/pdf/ggg_bipolar_ps.pdf
Any AC non center tap step down transformer with a secondary of 24-30v will work, right?


Here is my current bill of materials, am I forgetting anything?

(for poweramp)
Resistors (1/4 watt rating)
1 – 4.7 ohm ½ watt
1 – 680 ohm
2 – 22k
ICs
1 – TDA2030 or TDA2040 ammp IC
Capacitors (minimum 20 volt rating)
3 – 0.1uF film
1 – 1uF aluminum electrolytic
1 – 22uF aluminum electrolytic
2 – 220uF aluminum electrolytic
Other
2 – 1N4004
24 gauge stranded wire

(for bipolar supply)
Capacitors
2 – 1000uF Aluminum Electrolytic
4 – 0.1uF film
Other
2 – 1N4004
3-way power jacks/connectors
2 – Regulator Heat Sinks
Thermal Compound (heat sink grease)
22 gauge stranded wire
AC Cord/plug
2 – sets of nuts and bolts to bolt down the
regulators or to bolt the regulators to the heat
sinks.
heat sinks
110v in 24v out transformer (1.25A okay?)
2 10" speakers
Chassis
Cabinet
And I have all the stuff I need for the preamp.

Thanks, this looks like a great forum!