Solid State Guitar Amp Forum | DIY Guitar Amplifiers

Please login or register.

Login with username, password and session length
Advanced search  


SSGuitar has moved to PHP 7.1, enjoy the speed!

Pages: 1 [2]   Go Down

Author Topic: Velleman Kit 4001  (Read 2325 times)


  • Master SSGuitarist
  • ****
  • Chip Points: 2
  • Posts: 69
    • View Profile
Re: Velleman Kit 4001
« Reply #15 on: February 11, 2018, 02:45:41 PM »

You can't reduce gain very much, I guess minimum is around 20X , because it becomes unstable.
So reduce R2/R1 ratio to about 20:1 but not less, any ectra reduction myst be input padding."Which is not all bad, you can add a passive tone conrol which will be lossy anyway.
OK here is plan B. I've been playing around with the Lm386 opamp and decided it might suit my little enclosure better than the TDA2003. I thought id use 2 of the TDA2003 modules with each one driving a 4" car  speaker in some sort of cabinet. Maybe shaped like the Roland Street Cube

Sent from my SM-G935F using Tapatalk
Heres the beginnings of my stereo 2 x tda2003 project. Sounds a bit better than my previous enclosure with the 5w 4" 8ohm speaker. These very cheap 4" car speakers are rated at 4 ohms and 80W rms. Seems optimistic but they should be able for 4W rms. Still need a preamp for guitar use - any suggestions?
I also want to see if it works as a Smartphone amp. Planning some wine-themed styling on the wine box enclosure.

Sent from my SM-G935F using Tapatalk
BTW  i put a Kemo 12w module into the original enclosure. I found it breaks up nicely with a mic'd harmonica (as did the TDA2003 in fact).  Goin to add a back to the enclosure to reduce feedback. Just learning how important enclosure design is by trial and erroer.

Sent from my SM-G935F using Tapatalk

Pages: 1 [2]   Go Up

* User Controls
Welcome, Guest. Please login or register.
Did you miss your activation email?
* Recent Posts
Fishman Loudbox PRO-LBX-001 Schematic by DrGonz78
[August 15, 2018, 03:54:40 PM]

Centre Negative DC Jack by flester
[August 14, 2018, 03:46:09 PM]

Seized pots on a Marshall Guvnor Mk 1 by psafloyd
[August 14, 2018, 01:14:03 PM]

Using a choke for a TDA7293 amp by Enzo
[August 13, 2018, 02:10:41 AM]

Thoughts on the difference in sound between tubes and solid state by GB
[August 11, 2018, 06:15:19 AM]

* Sponsors