Electronic Circuits and Projects Forum

btw, i was looking at this circuit
http://www.aaroncake.net/circuits/supply6.htm

but that transformer may cause buzz...is there any way to do a transformerless supply?
or would a metal box keep the buzz out of the lines?

If you play an axe and you also dabble with electronics then this site is a MUST! You'll spend days clicking through the myriad of links and good info.

http://www.musicianstechcentral.com/schmatic.html#misc

The Xformer shouldn't introduce 60hz hum if you use a metal project box as well as keeping wires short and also loop a couple of turns of them through a ferrite donut or similar.
Below are some links to what you are looking for:

http://www.generalguitargadgets.com/pdf/ggg_reg_power_supply.pdf


a very clean pwr. supply:
http://www.generalguitargadgets.com/...lean_ps_sc.gif

here is the complete page of details on the above "clean" power supply:
http://www.generalguitargadgets.com/...=77&Itemid=106

Of course there are many websites with similar pwr. supply projects but this one seems fine and dandy. BTW, what guitar do you have? I have an original 1963 Stratocaster w/ original hardware, pickups, etc. It's worth a ton of money these days (thousands $$$) and to think I bought years ago for $125 from a guy that hated it and wanted a lower model Gibson instead!!

Originally Posted by HiTech

If you play an axe and you also dabble with electronics then this site is a MUST! You'll spend days clicking through the myriad of links and good info.

http://www.musicianstechcentral.com/schmatic.html#misc

The Xformer shouldn't introduce 60hz hum if you use a metal project box as well as keeping wires short and also loop a couple of turns of them through a ferrite donut or similar.
Below are some links to what you are looking for:

http://www.generalguitargadgets.com/pdf/ggg_reg_power_supply.pdf


a very clean pwr. supply:
http://www.generalguitargadgets.com/...lean_ps_sc.gif

here is the complete page of details on the above "clean" power supply:
http://www.generalguitargadgets.com/...=77&Itemid=106

Of course there are many websites with similar pwr. supply projects but this one seems fine and dandy. BTW, what guitar do you have? I have an original 1963 Stratocaster w/ original hardware, pickups, etc. It's worth a ton of money these days (thousands $$$) and to think I bought years ago for $125 from a guy that hated it and wanted a lower model Gibson instead!!

Thanks for all the links, ill have a look at them all.

killer deal on that guitar. I am just starting on guitar, got a PRS SE (older version) last month but I'm learning it fast even without lessons.

if you look in my sig like ill have my web page at myspace.com I will be putting up a song in a day or two, I'm working out some of the details in editing now and have to add drums and keys.

That clean supply posted with the LM317 is good. Something that seems silly to me is the use of a 25v transformer though. That gives around 34v at the input to the regulator! This high input voltage will waste serious power to give a 9v output. Use a 12v transformer instead if you use that design, it will give plenty of voltage, even 9v may do, it would with a lower dropout reg. You may need to up the value of the 1000uf smoothing cap though.

Originally Posted by Dr.EM

That clean supply posted with the LM317 is good. Something that seems silly to me is the use of a 25v transformer though. That gives around 34v at the input to the regulator! This high input voltage will waste serious power to give a 9v output. Use a 12v transformer instead if you use that design, it will give plenty of voltage, even 9v may do, it would with a lower dropout reg. You may need to up the value of the 1000uf smoothing cap though.

Thanks for the tip

Also, im going to take a guess and say that they ment a 68K resistor, not a 6k8

http://www.generalguitargadgets.com/bom/clnprbm.txt

ok i got 90% of the parts from the list link above but i still have to find the following

2 - 0.1uF (min. 35V)

1 - LM317 Transistor


I tried to get the parts all from allelectronics.com but the 6 - 1N4002 diodes had to come from mouser.com

as for that 1,000uF cap change, I ordered a 12V transformer and a 2200uF 35V to counter it.

The diodes arn't too critical, anything 1N4002, 03, 04, 05 etc is fine. Alternatively, for those 4 a bridge rectifier could be used as that is what the diode arrangement is doing (1A, 100v min).

For the 0.1uF, use ceramic caps, (100n as they'll be listed). They are there to stop the LM317 oscillating and ceramic have the best high frequency bypass caracteristics. Install them as close to the 317 as you can. 25v rating is fine on them seeing as you are using the 12v transformer.

The LM317 is very common, was it out of stock? It is an intergrated circuit, variable voltage regulator, not a transistor though in case you were searching the wrong terms.

got everything from allelectronics.com.

i did however find one of my old regulator ICs from that power supply that went from 1-30 VDC back a few months ago.

its the "LM317T Adjustable Voltage Regulator"

it looks like it will work so ill give it a try.

I got the following parts all from AE.com

(old photobucket link removed)

OK I just got all the parts in today for the power supply...some from all over the place.

I layed the parts in a blank board that's about 2" x 1.5" and ran into some problems near the end which I should have caught days ago when I ordered.

The list of parts seen here
http://www.generalguitargadgets.com/bom/clnprbm.txt

Says to get a "6k8" 1/4W resistor

Whats that?....While on the layout it calls for a "6k81" resistor

Another one that I found was in the parts list
A "270"ohm resistor is called for there but on the layout for the diode bridge seen here

http://www.generalguitargadgets.com/...lean_ps_lo.gif

A 274ohm resistor is in place, what should I use there?


When I ordered I looked at the parts list and assumed it was meant to be a 68k resistor and got that but looking at the layout and schematic sheets I think its supposed to be a 6.81k 1/4W (in place at r2b )

http://www.generalguitargadgets.com/...lean_ps_sc.gif


Last time I emailed the guy it took 4 days of waiting for a response and I really don't want to have to wait that long just to make another order which will delay me even more.

If you have any thoughts on what these parts should be post them.

Thanks