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This is a small tube-driven half watt guitar amp I'm working on. The current setup is powered by 12V from a generic DC wall power supply, I will probably change this to 8 AA batteries because there's far too much hum from the DC "wall wart." The tube is a 12AX7, and the half watt of power comes from an LM386, which I have the low-power version of, because the higher power version wasn't available. I will be uploading a short demo of it running through my 2 x 12 orange cab. This thing is really fun to play and sounds great! Only took me ~30$ worth of parts to make.
Category All / All
Species Unspecified / Any
Size 1280 x 960px
File Size 239.7 kB
Generic DC powersupplies are little more then a transformer and a bridge rectifier, I doubt it even has any voltage regulation.
Throw a pi filter in there and it should work just fine: http://en.wikipedia.org/wiki/Capaci.....r-input_filter
Usually you can just throw any old components for a marked increase in DC stability, but, if you want to work it out properly: http://www.calculatoredge.com/elect.....low%20pass.htm
Throw a pi filter in there and it should work just fine: http://en.wikipedia.org/wiki/Capaci.....r-input_filter
Usually you can just throw any old components for a marked increase in DC stability, but, if you want to work it out properly: http://www.calculatoredge.com/elect.....low%20pass.htm
Yep, I was just using a couple electrolytic 220uf caps to help filter it. Thanks for reminding me, completely forgot about the pi filter. I looked over some schematics from a production tube amp I worked on and forgot about using them since there's no real "power section" for this.
I do believe so, excepting the breadboard etc. I got them from various places, Allied Elec was having a sale on some of the overstock of their capacitors so I got like 600+ for around 20$. The tube is just a POS chinese tube so it was like 8$. The resistors were a radioshack bundle of a couple hundred assorted for 15$.
the main amp was sort of a design-for-replacement project
so the monoblocs are just custom layouts based on the TDA7294
with that said, there's little to really "design" beyond the application notes.
but there's still the matter of PSU and protection design.
i designed a set of speaker protection modules to include
the mixer/control amp is just a design exercise in op-amps, nothing special.
for my own needs, i don't do much discrete amp stuff
though i have a bogen CHS100A here that needs a complete rebuild
building that schematic/BOM was fun
so the monoblocs are just custom layouts based on the TDA7294
with that said, there's little to really "design" beyond the application notes.
but there's still the matter of PSU and protection design.
i designed a set of speaker protection modules to include
the mixer/control amp is just a design exercise in op-amps, nothing special.
for my own needs, i don't do much discrete amp stuff
though i have a bogen CHS100A here that needs a complete rebuild
building that schematic/BOM was fun
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