Here the circuit diagram of 25 watt high fidelity audio amplifier that build based on single Power Amplifier IC LM1875.
Component part list
R1 _____________ 1K R2 _____________ 1M R3 _____________ 22K R4 _____________ 10K R5 _____________ 180K R6 _____________ 1R IC1 ____________ LM1875 | C1 _____________ 1uF 50V C2,6 ___________ 100nF C3 _____________ 22uF 63V C4 _____________ 0.22uF C7,5 ___________ 220uF 50V Miscellaneous: Fuse holder & cover 2 amp fuses |
Circuit Desc:
The IC can be used with two power supply arrangements single supply and dual supply. We have decided to use the dual supply version. The single supply version would require the use of 63V electrolytic capacitors, thus increasing the cost and overall size of the module.
Here the low resistance connection tester which can be used as cable or wire tester, soldered joints and other types of connection with resistance value between 0.25 and 4 ohm.
Notes
This simple circuit uses a 741 op-amp in differential mode as a continuity tester.
This is a 18W audio amplifier circuit based on power IC HA13118. The supply voltage required for this circuit is 8 – 18V DC, at least 1 to 2 Amps. Maximum output power will only be obtained with a power supply of 18V at greater than 2 A, using a 4 ohm speaker. The power supply should be well filtered to reduce mains hum, a regulated supply will reduce noise even further. Extra filtering is unnecessary if operating from a battery supply.
Components
Resistors : R1, R2___________________ 2R2 ohm Capacitors : C1, C2, C4, C5, C6_______ 100uF/16V electrolytic capacitor C3_______________________ 10uF/16V electrolytic capacitor C7, C8, C12______________ 100nF C9_______________________ 2,200uF/25V electrolytic capacitor C10______________________ 1uF/50V electrolytic capacitor C11______________________ 100pF Misc. I.C._____________________ HA13118 Heatsink
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