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June 18, 2021, 11:12:50 PM

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1
Amplifier Discussion / Re: Pedal Hiss?
« Last post by Jazz P Bass on Today at 07:53:23 PM »
https://www.vakits.com/14-watt-single-channel-audio-amplifier-kit-1344
Stupid question: why did you knock down the 12Vdc battery to 9Vdc?
2
Amplifier Discussion / Pedal Hiss?
« Last post by ddpiax7 on Today at 08:27:58 AM »
Hello all,
Recently I built a cool amp based off of a kit I purchased off of eBay from a place in Florida called Valkits. Great little amp, if you give it a push….it uses a jfet as a buffer amp with signal being taken off the source side, so zero gain, but lower impedance, into a baxandall stack into a tl071, into a tda2030a. I added a jfet preamp using a j201, with a drain voltage of about 6 volts after a 22k resistor with 12 VDC fed from a Milwaukee M12 cordless tool battery! I also added a dc to dc 12 volt to 9 volt Amazon “converter” which is just a regulator, for a source of pedal power. It works and sounds fantastic, but with my pedals ran from the same supply as the amp, I get a constant white noise hiss. You can’t hear it with signal present but it’s really annoying! When I switch pedal power to an independent source, the hiss isn’t there! Any good noise filter suggestions?
3
Honey Amp / Re: Power supply suggestions
« Last post by mattbianconi on June 17, 2021, 02:05:56 PM »
Thanks everyone. I put the 10uf cap in and its doing great.  Love the gain sound actually. 
I put it in a 221x150x63.5mm case that I had from mouser. Just want to really thank everyone for this forum and this cool project.
4
Amplifier Discussion / Re: VOX Mini 3.. No speaker output
« Last post by Jazz P Bass on June 16, 2021, 12:52:11 AM »
To replace the ic properly the balls on the pcb have to be reflowed.
They make sheets of teflon with the correct spacing holes in them & you simply lay the sheet over the flattened balls apply flux and reflow the them.
5
Amplifier Discussion / Re: VOX Mini 3.. No speaker output
« Last post by joecool85 on June 15, 2021, 08:46:53 PM »
Here's a copy of the installation instructions but I must stress I don't make them anymore and don't have any!

Fantastic job, looks really professional!  No worries you don't make them anymore, still a very interesting share!
6
Amplifier Discussion / Re: VOX Mini 3.. No speaker output
« Last post by midibob on June 15, 2021, 12:21:56 PM »
Yep, my thoughts exactly. I did get some sample chips from Texas and replaced a couple but it was a hell of a job even with all my SMD stuff and a microscope. That's when I thought there must be an easier way. The icing on the cake was not having to remove the old chip. :dbtu:
7
Amplifier Discussion / Re: VOX Mini 3.. No speaker output
« Last post by Jazz P Bass on June 15, 2021, 11:42:49 AM »
What in the heck were they thinking when they chose that IC ?>>>?
Great for a cell phone but a guitar amplifier?
Come on !
Good job midibob!!
8
Amplifier Discussion / Re: VOX Mini 3.. No speaker output
« Last post by midibob on June 15, 2021, 08:59:18 AM »
Here's a copy of the installation instructions but I must stress I don't make them anymore and don't have any!

9
Amplifier Discussion / Re: Roland Jazz Chorus 50 troubleshooting
« Last post by Jazz P Bass on June 14, 2021, 07:01:26 PM »
The Reverb not working could be a faulty wire or transducer in the receive side of the tank.

The Vibrato working means that the circuit for Chorus works.
What differentiates the two is the switch. (Chorus does not use the variable Depth and Rate)
I would suggest that you check that.
10
Amplifier Discussion / Re: VOX Mini 3.. No speaker output
« Last post by Jazz P Bass on June 14, 2021, 06:52:03 PM »
The Vox amp uses the TPA3091 D1 ball grid array ic (cute!).
Midibob chose to use the SSM2305.
The layout that he chose is directly off of the datasheet.
https://www.badcaps.net/forum/showpost.php?p=350727&postcount=33
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