low waltage solid state power amp and a clean preamp

[kin0]

Hay I am building an ss amp. I have a preamp but I am looking for a power amp 10-20watt which will use 12valt. If it is a kit I want to be not so expensive. I also am looking for a good clean amp (with volume and 3 eq). Also if there will be a dist pot which could give a nice blues drive (but this is not so important).

[jkokura]

There's a project on the go here by Taylor Livingston called the Forum Amp. Take a look at the thread, and perhaps that will give you some idea of what could be offered soon. There's a little bit of a wait for it, but if you can hang on a month I think it's not unlikely you'll have a board in hand before Christmas.

Jacob

[kin0]

It is not a problem to design a pcb but I just need a project of a power amp.

[markeebee]

Yeah, I would say wait for Taylor's project because it will be awesome, no doubt.

If you really can't wait, you could go for this. I bought some, they work fine and were ridiculously cheap:

http://www.hobbykit.eu/hobbye/h1002.html

[kin0]

Okay another ideas. also any ideas for clean preamp?

[markeebee]

Really clean?

http://www.runoffgroove.com/tonemender.html

[kin0]

Okay I think I'll use the tonemender and the shred master as the preamp. All I need is a power amp+power supply. I though about the GGG power amp but I don't know how to make a power supply (bipolar 18 volt dc power supply). Also can anybody tell me how to get 9V and 18V form the same power supply (9v for the preamp and 18V for the power amp).

Oh and is there any good fx loops projects?

[petemoore]

Hay I am building an ss amp.
  Similar to a boost of any kind, requires power supply.
  I have a preamp but I am looking for a power amp 10-20watt which will use 12valt.
  If you have large current supply, perhaps distributing the power to multiple chips can be made to = 10-20 watts, take a look at the data sheets to ferret out more if attempting to make watts of power be very near power supply capability.
  An LM386 can work with 12v, but 1watt is pushing it.
  If it is a kit I want to be not so expensive.
  I also am looking for a good clean amp (with volume and 3 eq).
  Good/clean should start with speaker effeciency/frequency response, this can make huge variance to overall [limited power]  amplifier performance.
  You learn tone control at Duncan's TSC, the tonestack calculator interactively teaches you what the lines mean when they move up or down as you turn the TSC knobs, up means more signal of X frequency gets through. Using this makes it easy to decide how much signal cut you want to be able to get at X frequencies and whether you want the response line high or low [which shows output level @ Frequency shown on graph]...the deeper you cut the frequencies, the more frequencies are cut out = the lower the TS output will be.
  Also if there will be a dist pot which could give a nice blues drive (but this is not so important).
  12v should run most of the transistor or opamp distorters, its' not a big chore to drop a few volts using 7809 voltage regulator.
  Building the distorter outside the amp makes it easier to mod and try distortions, it can take quite some time to try distorters out, many mods are things better done outside the amp.
  Can suggest DIST+ Or OD250 type since that's what I use anyway, compression suggestable to keep clean peaks from exceeding the range of a SS outputs power limit.
  I have one of these:
  http://www.parts-express.com/pe/showdetl.cfm?Partnumber=265-079

  It doesn't have a power supply, or...didn't, I also bought one of these:
   http://www.parts-express.com/pe/showdetl.cfm?Partnumber=120-532

  Hard to beat...
  I built a 2x LM3886 stereo amplifier starting with:
   http://www.parts-express.com/pe/showdetl.cfm?Partnumber=122-640
  And it uses capacitors dude blew his car-thumper amp up with [excellent source for caps Me things]...very much work building the structure for the PS with secure IEC cable, FWR bridges, amp/cap/heatsink etc.
  Also an LM3875 type amplifier that I ran from an old stereos power supply ! This makes on the cheap near zero outlay !
  The amplifiers can all be made to work excellent enough that they no longer matter, any one of them...the power supply though...making this to where it doesn't matter means it will require large enough 'muscle' to hold DC supply voltage up, in my experience, this gets ugly.
  Yup. looked at, studied, built from components, built from chips, had power supply smoke, lack of heatsink damage. many of these things, others too [LM386's, Mosfet amp, Bipolar output etc.], and I'm not artist when it comes to metalworking either, a stamped out/prebent/ factory amp that works with installed IEC /jacks [and anything else]  makes the prebuilt units be very easy choices.

[kin0]

 I want the amp to be at least 15watt so I think I'll go with higher volt power supply (but I have no ideas how to build it and how to adjust it to 220 volt which we use in Israel. I understand in America you use less). For preamp I will go with shredmaster and tone mender and maybe later I'll add an fx loop. Still I don't know which power amp to build and what to do with the power supply. I prefer cheap stuff cause I am a teen and I don't have a lot of money (But lots of resistors and capatitors). Thanks for the comment above. I understood some things (mainly about the preamp) but other things I haven't understood at all (about the power supply and the power amp). Also do you know why the transformer cost so much?


To get 18volt biopolar power supply can I first use this to get form 9v a 18v http://www.geofex.com/circuits/+9_to_33.htm
and then use this to make it bipolar http://gaussmarkov.net/wordpress/circuits/bipolar-9v-power-supply/?

[markeebee]

It's ok, I don't understand everything Pete says.  But it's all good stuff.

It is not a problem to design a pcb but I just need a project of a power amp.

If you can design/make a pcb, I would again suggest the hobbykit 20W power amp that I linked to above.  The power transistors are about 3 Euros on Ebay, sounds like you already have the resistors and caps that you'll need.

Use the power supply from an old laptop, you can always find one somewhere - ask around at college maybe?