I've found that if im using a passive tone stack then i need a preamp of some type in front of it. I havn't tried an active tone circuit so I can't say for that.
Mike
Mike
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Show posts MenuQuote from: jfetter on July 13, 2007, 02:49:38 PMCool, i've got one coming. Looks like a nice little amp.
the IC is "presoldered", you have to install the caps and resistors- not too hard.
Bruce
Quote from: Kludgemaster on July 14, 2007, 01:59:53 PMIt looks like it's a TPA3001D1
Does anyone know what chip the UAM2 is using? I cannot tell from the Ramsey site.
Quote from: jfetter on July 11, 2007, 05:15:10 PM
I have used this eval board/kit to drive a "red fang". Veryy loud.
http://www.ramseyelectronics.com/cgi-bin/commerce.exe?preadd=action&key=UAM2
I have not used this new one:....bridged 50w -> 3ohm
http://www.analog.com/en/prod/0,,765_1075_AD1994,00.html
My new project is using a jfet (fetzer) preamp and a dsPic33f dsp for a one chip instrument amp. It is in the software & parts procurement stage. I'm using an Analog Devices 100ksample A2D with a "ucd" dsp "in-the-loop" design. its fun anyway.
Quote from: joecool85 on July 07, 2007, 07:45:22 AMWell, the preamp I posted, I used 2 of them one for each channel, then into a standard fender style tone stack, I think any would have been good, then I combined the 2 signals to one using an opamp adder circuit and went into this.
Looks great man, great to know you got it all worked out! Could you post some sound clips maybe?
**edit**
Maybe I missed this, but what are you doing for a power amp on this circuit? I'd love to see a schematic, or at least know what you are using for an IC.
Quote from: teemuk on June 28, 2007, 02:21:06 PM
Stuffing the circuit into a metal box helps but IMO amps shouldn't buzz annoyingly unless the source of interference is right next to them. How is your wiring? Is it excessively long? Do you have wire loops that act as antennas? Does your PCB have similar loops? Can the wiring capacitively couple some interference? Do you run low amplitude signal wires near high current wires? Is input jack near output jack or the supply wiring? Do you have very short wires from input jacks to the first gain stage. Do you use shielded wire where it's needed?
...You know, the usual stuff.
Also: Check that DC supply of yours. Make sure that every connection related to it is OK and tight. I've had nothing but troubles with my 12VDC practice amp that is powered from a wall wart. The DC sockets and jacks of those things are always a bit "loose" and therefore sometimes begin to create infernal buzz or shoot sparks.
Quote from: teemuk on June 27, 2007, 12:46:38 PM
http://www.ssguitar.com/index.php?topic=288.0
Edit: Since it's pretty hard to get DC-powered systems to buzz now matter how bad the layout is I would check that you
a) have a proper common reference in all your inputs - especially when nothing is plugged in. In other words, there should be a resistor that shunts the inputs to common.
b) have properly bypassed the opamp dc supplies with small value capacitors in as close proximity to supply pins as possible
c) do not play in presence of computer monitors, fluerescent lights etc.
Quote from: tonyharker on June 27, 2007, 11:17:05 AM
You could have a ground loop. The grounds should all go separately to one point ideally on one of the smoothing capacitors. If you have connected the grounds to one another then that is the problem. Also the input jack ground should be isolated from the chassis and go directly to the input ground connection.
Do you have a schematic/diagram you can show us?
Tony
Quote from: LJ King on June 27, 2007, 09:53:54 AMmy first thoughts are a ground issue, it goes away when I touch the metal plate everything is mounted on. I'll check later when I get back to my workshop.
It sounds like you are either missing a ground connection or have an improper one in the amp. Check the input jack connections first.