Power Amplifier

This be subwoofer filter low pass frequency circuit, for filter especial low frequency has passed by still the amplifier microphone. By this circuit uses op-amp IC number LF347 , perform the circuit filters low frequency change well, It make the sound that go out to have only low frequency ,about 100HZ not exceed. By [...]

This be mini size power amplifier 2 watt OTL that use IC LM380. Be base readymade circuit for side sound work and the communication. Which use outside equipment adds least. The C6 can choose get many the value since 47uF to at 470uF which , have a voice good bass. The C3 use for [...]

This is mini size intercom circuit. It uses IC Op-amp number LM380 just one as a result can work already. When switch S1 stay in a position speaks loud show in circuit picture. The loudspeaker of mother station will perform to is microphone for drive op-amp. By change step up transformer or T1. The [...]