Is 15-0-15 supply A/C?

[chuck55]

I got a tone control and input has 3 terminals +15 0 -15.

I got a 15VDC power supply but it doesn't seem to work as it only has 15VDC and ground. I hooked up 15VDC to both 15 v inputs but that didn't help either.

Any help??? Where do I get a 15-0-15 P-S.

Thanks

[discrete]

You need something like this:

Low Current Bipolar Power Supply (LCBPS) - A Regulated CRC Supply

or 2 isolated 15Vdc supplied tied in series, with the common junction becoming the 0V.


But feeding +15Vdc to the -15Vdc terminal may have fried a few components....

[picowallspeaker]

Or...if the circuit doesn't absorb too much current ,you can try ,with 15 VAC , a voltage doubler with two capacitors (1000 uF) in series between (+) and (0)V.
The junction between the two capacitors will be the (0)V-Ground.
You'll need one more cap and two diodes less ( a full wave rectifier needs 4 diodes , a voltage doubler ...two)

[ostripper]

I hooked up 15VDC to both 15 v inputs but that didn't help either.

That might of damaged your circuit as you reverse biased the negative supply input. Very doubtful that they included foolproof diode protection against this.

PS - circuit below without the 7812/7912 using the a cheapo radio shack 12-0-12Vac trafo would work (real cheap -<$10) , the complete circuit with 7812/7912's would be better.

OS

[chuck55]

Thanks for the help. I will let you know if I get it working.

Of course Analog Metric on Ebay, who I bought this from, ignores my e-mails and never mentioned anything like some oddball P-S before I bought (

[jaycee]

A symmetric power supply is not really considered "oddball" in audio, it is quite common in fact.

[Tekko]

In fact its much more common than single rail supplies, single rail is almost obsolete nowdays, only used in the cheapest of cheap compact stereos.

Anything with atleast a grain of quality use split rail.

[Mooly]

Originally Posted by Tekko

In fact its much more common than single rail supplies, single rail is almost obsolete nowdays, only used in the cheapest of cheap compact stereos.

Anything with atleast a grain of quality use split rail.

You think so

Have you actually listened to any top flight AC coupled designs...

[Mooly]

chuck55...

As its a tone control and presumably low current you might try two 9 volt batteries in series to give a -/+9 volt supply that might at least prove your circuit works OK. The centre connection of the batteries becomes the "0"

[Tekko]

Mooly, capacitors to transmit high power ? I dont care if THD is 0.0000001% if a capacitor have to transmit current from the amp output to the speaker its a bad deign by default in my world, it falls under excess dc offset on the amp output in my book.

Single rail is only used to reduce manufacturing cost and allows usage of a transformer thats cheaper and faster to make, hence its only used in really cheap crappy compact stereos.

I don't think i've EVER seen a stereo above 50 euros that have used single rail supply that have been newer than mid 90's.

In high end equipment, capacitors in the signal path is the biggest nono of all.