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/4ΩHow to build Collection of Little Bridged Power Amplifiers - circuit diagramParts 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/8ΩHow to build Collection of Little Bridged Power Amplifiers - circuit diagramParts 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/4ΩHow to build Collection of Little Bridged Power Amplifiers - circuit diagramParts 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]How to build Collection of Little Bridged Power Amplifiers - circuit diagramParts 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

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