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Look at this tiny thing. It`s a super simple 12AU7 single ended stereo amplifier. The tiny egg-sized output trannys are reverb transformers.
I`ll post more when I build it these days!
No schematic yet, but it`s quite similar to the one posted earlier here. Perhaps I`ll put some bigger caps in the powersupply. I`ll probably finish it today or tomorrow.
nice toy, should be something like this, around 200mW:
Something wrong with the schematic: You cannot run the thing straight from the power line - there has to be a power transformer.
Cheers,
Martin
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Something wrong with the schematic: You cannot run the thing straight from the power line - there has to be a power transformer.
Cheers,
Martin
Actually you CAN, but you shouldn't!
Still seems a lot of feedback. No oscilation with those trafs?
if the input has a transformer and the output (without feedbacK) and ground ofc. didnt they use power transformer less designs for PA systems?
You just need to not connect anything to the power ground (AC supply power ground), as most single phase AC have the neutral connected to ground (and you'd have a big BANG)
They used to do a lot of these things in low cost systems decades ago (e.g. guitar amplifiers, record players etc).
You cannot do this nowadays - for good reason. 🙄
(of course there are modern transformerless designs but they use other means of protection).
I strongly recommend not to post these kind of schematics without warning on internet forums, because there will always be a kid who knows how to solder but not what he is doing... (actually if you check the forum rules the moderators think quite along the same line).
Cheers,
Martin
You're quite right, waterver you do it will never be safe not to use a transformer. Sorry if I suggested it could be done.
So guys, NEVER do it like this.
Link to dangerous schematic removed. Please see forum rule #3. This is NOT allowed on this forum.No worries, I already have a nice tranny on the chassis. haha that sounds weird..
Anyways, I have already built a supersimple mp3 amp. It`s ugly as hell but it sounds awesome and with a fuzz pedal, it actually make some sweet tones. The layout will be similar.
Here it is : Dont laugh.. It`s made of scrap and I dont give a damn how it looks. The output transformer is a spare filament transformer
Anyways, I have already built a supersimple mp3 amp. It`s ugly as hell but it sounds awesome and with a fuzz pedal, it actually make some sweet tones. The layout will be similar.
Here it is : Dont laugh.. It`s made of scrap and I dont give a damn how it looks. The output transformer is a spare filament transformer
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Haha. Not that ugly but funny. Anyway, with a little work it can look awesome. Believe me.
I like drugs too.
A little threadjacking can't be that bad.
Here's my toy tipetu, still unfinished. Calculations say it should output 350mv. Ooh. Gonna rock the house with this one! Yes, a 6V6 but only 200 volts and triodized. Anyway, good for laughs. To paint this outcast I used my renowned salad dressing 'technique'.
Here's my toy tipetu, still unfinished. Calculations say it should output 350mv. Ooh. Gonna rock the house with this one! Yes, a 6V6 but only 200 volts and triodized. Anyway, good for laughs. To paint this outcast I used my renowned salad dressing 'technique'.
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...And the chairs a in a nice straight line too.
Sadly, I don't have a photo of my first tube project - it wasn't pretty. Tipetu's is rather a lot better.
Better late than never. Here it is! It works pretty good. Sounds and looks cool too.
An externally hosted image should be here but it was not working when we last tested it.
An externally hosted image should be here but it was not working when we last tested it.
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