Collection of Little Bridged Power Amplifiers

Description

It is a little collection of amplifiers in bridge connection. The output power is low and they are for general use. They can be used with small active loudspeakers, car stereos etc. The only restriction, is that we should use loudspeakers with resistance above 4 ohm.

Circuit diagram: Bridged Amplifier 15W/4Ω

Parts list

R1-5=2.7ohms
R2=100ohms
R3-4=2.2ohms
R6=220ohms
R7=1Mohms
C1-9=10uF 16V
C2-8=220uF 16V
C3-4-5-7=100nF 63V
C6=470uF 25V
IC1-2=TDA2002
TR1=100Kohms trimmer
Lsp=4....8ohms/40W Loundspeaker

Circuit diagram: Bridged Amplifier 35W/8Ω

Parts list

R1-3-5-7-9=22Kohms
R2-8=680ohms
R4-6=1ohm
C1=4.7uF 16V
C2-7=22uF 16V
C3-6=220nF 100V
C4-9=100nF 100V
C5-8=200uF 25V
IC1-2=TDA2030 --LM1875
Lsp=8ohms/ 60W Loudspeaker

Circuit diagram: Bridge power amplifier 25W/4Ω

Parts list

R1=120Kohms
R2-5-6=1Kohms
R3-4=12 ohms
R7-8=1 ohm
C1-5-7=220uF 25V
C2-10-11=100nF 100V
C3-4=2.2uF 25V
C6-8=100uF 25V
C9=10uF 25V
IC1=LM2005M....TDA2005

Circuit diagram: Bridge power amplifier [Po=1W Sp1=4Ω Vs=+6V] [Po=4W Sp1=8Ω Vs=+12V]

Parts list

R1-2-4-5=270ohms
R3=2.7ohms
VR1=10Kohms Log. Pot.
TR1=470Kohms Trimmer
C1=100uF 25V
C2=100nF 100V
C3=10uF 25V
C4-5=22uF 25V
C6=47nF 100V
IC1-2= LM388

circuit from http://users.otenet.gr/~athsam/bridge_amplifier.htm