Author Topic: Low volume from Tillmap Preamp + TDA2030 based amp. What I might be doing wrong?  (Read 1076 times)

My idea was to create an AC powered practice amp which allows me to connect a guitar directly or use with pedals. So started out with a simple Tillman JFET preamp + TDA2030.

TDA2030 is powered by a 12v DC supply and I have a toggle switch to bypass preamp in case I am connecting a pedal. I am getting a decent output when used with a pedal or connect a music source such as a phone's music output. The problem is when used with a guitar. I am not too happy with the sound output. This gets even worse when used with a piezo pickup.

What I might be doing wrong?

This is test with a pedal and sounds OK - https://www.youtube.com/watch?v=VXDg2M5mVRU

Has it to do with the drive coming from preamp? I used the schematic as in http://www.till.com/articles/GuitarPreamp/
TDA2030 board I am using is https://www.aliexpress.com/item/32714680347.html?spm=a2g0s.9042311.0.0.27424c4dTbbyyt

Thanks
« Last Edit: September 30, 2019, 10:04:43 AM by IndianMetalHead »

antonis

"I'm getting older while being taught all the time" Solon the Athenian..
"I don't mind  being taught all the time but I do mind a lot getting old" Antonis the Thessalonian..

I remember using 3M resistor as R1, but can double-check.

I also tried a TL072 buffer with unity gain, similar outputs. So has it to do with the gain?

antonis

Can't say for sure unless you post the complete schematic..
(i.e. preamp with TDA power amp..)
"I'm getting older while being taught all the time" Solon the Athenian..
"I don't mind  being taught all the time but I do mind a lot getting old" Antonis the Thessalonian..

seismicall

Has it to do with the gain?  ;D
Download happy wheels 3D