Hello everyone. I have a pretty simple question. After looking at a lot of schematics, I've noticed that some placed the inicator led between the +/- power rails and some place it between the + rail and ground. Why? Is one way better than the other? I've built a solid state amp that has a tda7294 chip amp in the output and uses a split rail (+/-) supply. Any help would be apreciated.
anybody give me some advice.. my solid amp power amp IC Keep blowing when I install new one..after a minutes of playing maybe 15 minutes with my amp the power amp ic goes on tiny little humming sound inside then 'pliccck it made a crack on the ic itself and smells sucks and the output sound gone..then I change it to a new one ..and clicks and broke again...
what would be the problem of this??can anybody help??
Hi. I have an old kasino amplifier that used to be my favorite amp until a part went bad. The part looks like a germanium transistor, and has the number 61008 printed on it. It appears they used it as a diode. My question is this. What can I use as a replacement? I'd really like to get this one working again. Any suggestions would be greatly appreciated. Thank you.
Hey, guys so i thought i need a battery amp to throw in my pedalboard/guitar case so that i can jam in a pub on my way home from the studio and i really wanted the mini tweed thing as it's actually wooden and looks really cute as a shelf object.
I'm planning on improving the tone.
I got myself a 3x5 vintage oval alnico speaker that I'll put into the cab and I'll probably convert it to be open backed to get a little less of the can of bees tone, but I'm wondering about what can be done with...
anybody knows here the dc output power rating of the power transformer of marshall mg15cd guitar amp series? or what the voltage on primary and secondary..??
im searching for building an amp..
I ordered 2 MOD reverb pans to try out in my amp to replace an Accutronics pan. I think I prefer one of the MOD pans, but the noise from both is unacceptable. My reverb had no discernible hum with the Accutronics, but with both MOD pans there is a hum that gets louder as the reverb is turned up. I tried turning it around 180 degrees and didn't notice a change. It is in the bottom of my 2x12 combo, so it is pretty far away from any transformers in the amp. Any thoughts?
Recently I bought the Sl-5 which is a very nice sound amp,
despite that for a couple of days I am trying to modify the sl5 to the jubilee 25/50 specs.
I found those schematics:
Jubilee 25/50
SL5
Do you think If I put the 0.047u on the input (before the 68k), change the 220pf to 47pf on V1 and add parallel a 0.68uf to the 2.7k will make any difference?
Can you please tell me what changes are the best to make the SL5 soundlike a jubilee (if thats possible).
Schematic didnt say anything about HT. BUT a few months ago I made a simulation based on schematic and the waveforms chart available somewhere online. According to that 12ax7 should be running between 125-130V. I think that info will be usefull for people that's into repair, right?
I will post later the links to the schematic when i can find them.
I got this amp a while ago. There isn't any identification as to brand or anything anywhere inside or outside the cab or the amp. Just this one logo. Does anyone have any idea of the brand of amp/cab this is? It certainly seems like a set.
I'm assuming this is probably something purchased through a catalog or department store (like Sears) in the 70's. I can take more pictures of anything if it will help. Just trying to get some info on this and even better would be a schematic as it needs a...
Hi
This is certainly not stompboks, but I'm sure that they will help me here)
Since there are no schemes in good quality on the Internet, I attached the lonestar scheme, as the closest analogue.
I'm interested in one question, before the last stage of amplification is the RC filter 2M2 // 20p, I'm confused that the resistance of the resistor is very large, and the capacitance of the capacitor is very small.
As far as I understand, there will be a large loss of volume and also this filter will...
So, I wanted to add some EQ options for my home stereo system, as it currently has no EQ controls. I'm gonna mess with the LM1036 chip. I was lazy and just ordered a mostly prebuilt PCB of the stock data sheet circuit. Its got controls for Volume, Bass, Treble, Loudness, and Balance. All fine, except I already have a balance control in my system and don't want to add another one. So, any ideas as to how to remove the balance control so its just fixed at 50/50. The PCB should arrive in a few...
I have a Laney Cub 10 which has a nice crunch to it, but even with a speaker upgrade it's a bit dark. If my tone control would only go to 11..... Anyway single coils and bright humbuckers are great but I wouldn't mind a bit more brightness for some other guitars. A schematic of the amp is here:
On TGP a simple mod was posted for achieving this goal but before I tear out the iron and break something I'd really appreciate if someone that knows what they are doing wouldn't mind taking a look....
Could anyone give me very general idea of how elements like air conditioning controllers so the parts where in a car you setting up temperature, with led displays etc are programmed nowadays? So assuming we have a plastic panel with buttons on it, led display and what not, and when I press + I want temperature to be increased or some mechanical parts to take action.
I'm guessing that there is ROM and some CPU chips: where software controlling the parts is stored. Now this software is usually...
This is my first post, so I'll start with a little introduction.
I am an avid DIY-er but I do not have much experience with electronics. I recently pretty much finished building two guitars for my 5-year old (both small scale ES-335 type). I built everything form scratch, including home wound humbuckers. The guitars are finished in a sense that you can plug them in and play, but there are two additional things that I wish to do.
Wanna know if anyone might be able to get or find a schematic for a Kustom X MPA MONOURAL 135 @ 8 ohms Power Amp
which was made in the early 70’s....
When I hook up this amp through a p.a. System I get sound for about 5 minutes and then it starts to have an unbearable LOUD hiss which cannot be controlled by the volume at all...
I then turn it off....
Any help would be appreciated.....
Jim
Say that I would want to use a combo as a speaker cabinet, do I simply ad a jack that goes to the speakers, impedance aside, are there any other issues?
I was needing a new amp which is smaller than my usual setup so my credit card treated me to an EVH 5150 combo until I am able to sell my older amps to pay Mr. Card back.
My first impressions are good and the sound is great, ch3 is so dirty it's unbelievable whilst ch2 has the definitive Van Halen sound but can be dialled up with different crunch sounds. Ch1 which shares all the ch2 controls goes from clean to dirty very quickly with the gain control.
This is my first and (until recently) only guitar amp. Served me well gigging every weekend in a decently popular working band, but its too big and loud for what I do now- bedroom playing and home recording.
It also started acting up a while back- scratchy pots, and intermittent feedback on the distortion channel. Local music shop sends them away to an electronics repair shop, which charges $80 to diagnose the problem, then $80 and hour (minimum 1 hour charge) plus parts to fix it.
I was using my Danelectro Honey Tone amp with an audio signal probe I built to troubleshoot audio circuits. It worked great until I used it to probe a tube preamp circuit. Now there is no output. I think I blew the op amp (TL072) because the signal is too high in a tube preamp. I will replace the op amp as soon as I can get one.
What would be the best way to limit the input signal to this little amp? Would zeners on the input be a good way to limit the input signal?
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