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Good quality 2 transistor electret microphone amplifier 20 Hz-20 KC (3V-12V) schematic & demo
Two transistor condensor microphone capsule/amplifier explained (~ schematic/practical circuit)
Loudspeaker used as microphone with a 2 transistor amplifier: electronic schematic and demo
Amplifier max 2-3 Watt for audio/radio or another application, drive a coil etc (schematic & demo)
Mini audio amplifier on 0.3 Watt 6-12 Volt that everyone can make (schematic & demo)
Audio pre amp with bass boost made for a 100 K input audio Chip/End amplifier (schematic & demo)
IF amplifier for a superheterodyne radio made with ceramic filters on 450-470 KC, demo & schematics
Good quality 2-3 Watt audio amplifier with pleasant (bass) sound: schematic and demo
VLOG 4 Beat Frequency oscillator for an IF filter 400 - 600 KC to receive SSB/USB: demo/schematic
Finally success to make a good quality Long Wave (TRF) radio: demo and schematic
High End Microphone Pre Amplifier
Electret microphone and microphone amplifier with a bipolar transistor