Tube Driver Guitar Pedal Power Adaptor

[mitz]

http://www.generalguitargadgets.com/...d=83&Itemid=26

hi, im trying to build one of this but on the part list, it says 12 V power adaptor so, i went to buy one but there are lots of different styles like 12 VAC or VDC 500mA, 300mA etc..... i wasn;t sure which one to get.

Could anyone let me know which one is good for this?

ps is this one good???
http://cgi.ebay.ca/ws/eBayISAPI.dll?...m=380066075546

thanx!

[tboy]

there are lots of different styles like 12 VAC or VDC 500mA, 300mA etc..... i wasn;t sure which one to get.

What you need is a 12.6 VAC filament transformer with a current rating around 175mA (or greater).

ps is this one good???
http://cgi.ebay.ca/ws/eBayISAPI.dll?...m=380066075546

No.

[mitz]

thanx!!

[mitz]

http://cgi.ebay.com/Boss-Roland-BRA-...em150296760744
i just googled more and someone said this would work if i wanted to use power adaptor instead of transformer.

is this correct?

[52 Bill]

http://cgi.ebay.com/Boss-Roland-BRA-...em150296760744
i just googled more and someone said this would work if i wanted to use power adaptor instead of transformer.

is this correct?

Yes, as long as it is AC (alternating current), it would work.

You can find these AC Adaptors at most electronics houses for far less that that though. Try Jameco or Mouser

[Mark Hammer]

It will work, but I'm pretty confident that you should be able to purchase something similar locally for a fraction of the advertised price and shipping cost.

12VAC transformers are pretty common things. Even Radio Shack sells them.

[dskowron]

. . .12VAC transformers are pretty common things. Even Radio Shack sells them.

I've even seen them at 7-11.

[mitz]

http://www.mouser.com/Search/Product...n%252b2w%3d%3d

only thing different from ebay item is that this one's wattage output, this one is 6W and ebay one is 11W.

does this one would work?

thanks in advance!!!

[52 Bill]

According to the spec sheet, it will output 12vac @ 500mA, so yes it will work just fine.

[Enzo]

12v at 175 ma is only about 2W, so 6W is plenty

[Robert M. Martinelli]

Hi,
Though I like this OD's design, I find the PS design very "minimal" , so I would make some modifications on this stage; the first thing I would do is to supply the tube's heaters at 6 ( 6,3 nominal ) VAC in parallel ( 0,3 Amps ) rather than 12 ( 12,6 nominal ) in series - all the older datasheet I own agree that with parallel heaters supply hum is much lower; being this an OD desing, I think this factor to be very important. The second thing I would do is to separate the IC and tube supplies, making the first regulated and better filtered.

To improve the OD noise performance, I would recommend to use metal film resistors, also, I would suggest to use a 4+4 DIP socket and try to substitute the RC4558 with an NE5532 ( pin-to-pin compatible ). If noise is not a concern I would also try TL072s/TL082s ( pin-to-pin compatible as well ), maybe they' re a little noisier than a 4558 / 5532 but they could yield interesting results sound-wise due to their JFET input circuitry. As usual, experimenting could be the funniest part of the process

Hope this helps

Best regards

Bob