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August 10, 2022, 08:18:04 PM

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Recent posts

#1
At this point I'm switching to building something for guitar. (and maybe vocals) Going to put the TDA2003 board to good use, I hope.
#2
The Newcomer's Forum / Re: Busking Amp for Bass & Voc...
Last post by joecool85 - August 09, 2022, 09:08:10 PM
No buffer needed between the power amp and the preamp (Bluesbreaker).  That said, I've never used a BB as a preamp.  You won't know if you like it till you try it.  My guess, you won't have enough tonal control.  You like the sound of them which is great, but you don't send it into a flat eq'd amplifier - you send it to a guitar amp.  Even when you set a guitar amp eq to look flat, it has a large mid cut and sometimes other shaping.
#3
The Newcomer's Forum / Re: Busking Amp for Bass & Voc...
Last post by Puguglybonehead - August 09, 2022, 01:36:41 AM
Still haven't made progress with this project yet due to being sidetracked with other problems. I've decided that building a busking amp for just the guitar or maybe guitar and vocals would be a better approach for now.

I was considering using this Blues Breaker pedal kit as a guitar preamp. (I like the sound)

https://www.musikding.de/docs/musikding/breaker/breakerschalt.pdf

I already have a premade TDA2003 board around that I could use for a power amp.

https://www.jameco.com/z/VM114-Velleman-7W-Amplifier-Kit-Assembled_2151881.html

Or I could go with this TPA3122 kit to have a channel for guitar and a channel for a mic. 

https://www.parts-express.com/Sure-AA-AK32151-2x15W-Class-D-Stereo-Power-Amp-Kit-TPA3122-320-322

I was just wondering if I would need a buffer between the Blues Breaker and the power amp board?
#4
Amplifier Discussion / Re: 12w Marshall
Last post by joecool85 - August 08, 2022, 08:51:11 AM
Great work!  I split the topic though and made this it's own so it can be an easy resource for others later.
#5
Amplifier Discussion / Re: Re: Adafruit PAM8302 Ampli...
Last post by Jazz P Bass - July 30, 2022, 12:41:30 PM
Nice work!
#6
Schematics and Layouts / Re: Ibanez TSA30 Schematic and...
Last post by theaterguy - July 28, 2022, 03:49:53 PM
Hi all, I finally made myself open this thing and did those easy mods that everyone should do. Resistors R4 and R5 changed to 100K. Tames a lot off noise.
#7
Amplifier Discussion / Re: Fender 112 Deluxe Plus
Last post by FenderDeluxe112Plus - July 24, 2022, 10:09:07 AM
Thanks Phil,

This is the method I have been using so far, I thought there might be other ways to test in circuit.
#8
Schematics and Layouts / Re: Searching schematic fender...
Last post by phatt - July 24, 2022, 09:09:28 AM
Yes TassieVikingman,, fp is short for Flame Proof. ;)

@ Scooby,
Those resistors often run warm but as they drop a fair amount of voltage they cop heat, if the 130-Ohm resistor has burnt then the resistance may have dropped and then  C285 has likely been running over the voltage rating and died, as you have found. I'd replace C286 while you are there. Even better replace with 35volt caps.

If those 2 resistors are running very hot that can shorten there life.
If excessively hot in normal use you can use 2 watt resistors which will run cooler and hence last longer.
Phil.
#9
Amplifier Discussion / Re: Fender 112 Deluxe Plus
Last post by phatt - July 24, 2022, 07:59:04 AM
I get the impression you are not clear on diode testing, If so then
You check diodes with power OFF and lift one end of the diode.
Meter set to diode test.

If you get a reading both ways it's dud.
To save writing it all,, go here;

https://www.fluke.com/en-us/learn/blog/digital-multimeters/how-to-test-diodes
HTH,Phil.
#10
Amplifier Discussion / Re: Fender 112 Deluxe Plus
Last post by FenderDeluxe112Plus - July 24, 2022, 02:57:03 AM
Thanks Enzo,

Where would be the next logical points to test?