Power amplifier 50W 2N3055 MJ2955
A very simple power amplifier circuit built with 741, 2N3053, 2N4037, 2N3055 and MJ2955 which deliver up to 50W on a 8Ω speaker.
If you want to amplify lower frequencies increase the 4.7uF capacitor from the audio input or decrease it if you want to favour higher frequencies.
Use a 3A symmetric power supply for mono application and a 5A for stereo power amplifiers. Please take good precaution when use this audio amplifier : do not shortcircuit the output or not connect speakers ! Allways check twice !
Power amplifier pcb:
Read the rest of this entry »
Bridge audio power amplifier TDA2030
A 35W audio power amplifier built with TDA2030 in a bridge connection with a +- 15V symmetric power supply. It is easy to build, do it yourself audio amplifier which will deliver up to 35W on a 8Ω speaker. Please use a good headsink to cool down the TDA2030 power amplifier.
TDA2030 integrates circuits are very cheap and usefull if you want to start a small audio amplifier. The only thing you have to consider is to use a good power supply and heatsink or you’ll risk to burn this precious IC amplifier.
Read the rest of this entry »
Reverberator with TDA1022
The first reverberator we present is based on TDA1022, the most used BBD.
Reverberator adjustements for proper functionality:
Before we connect the power supply, extract IC2 and IC3 from its base and adjust the potentiometers to middle position. On one of IC2 or IC3 entries connect a frequency-meter and/or oscilloscope. On oscilloscope monitor will be visualized the rectangular pulses with point to point amplitude equal to power supply voltage and a space factor of 1:1. The frequency of this pulses is adjusted with P3 between 3 and 18kHz. Check that voltage value on IC2 pin 5 is 7.5V dc.
Read the rest of this entry »
