Bridge amplifier

Collection of Little Bridged Power Amplifiers

�� . � �� . �� , �� . � �� , � �� 4�.

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.

Fig.1 - Bridged Amplifier 15W/4�

Bridge_amlifier_15W.gif (7229 bytes)

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

Fig.2 - Bridged Amplifier 35W/8�

Bridge_amplifier_35W.gif (8259 bytes)

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

Fig.3 - Bridge power amplifier 25W/4�

Bridge_amplifier_25W.gif (14806 bytes)

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

	Fig.4 - Bridge power amplifier
	[Po=1W Sp1=4� Vs=+6V]
	[Po=4W Sp1=8� Vs=+12V]

Bridge_amplifier_4W.gif (11750 bytes)

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

Sam Electronic Circuits 8/01

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