Amplifiers circuit diagrams
Stand-alone, 9V battery powered unit. Three-level input selector, three-band tone control
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Bass, Treble, Harmonic modifier and Brightness controls. Output power: 40W into 8 Ohm and 60W into 4 Ohm loads
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Built around an LM380, this amplifier includes tone controls and electronic "soft switching". The soft switching circuitry ensures power is built up gradually eliminating the dc thump.
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A 15 watt amplifier made using discrete components. Sergio designed this circuit for his Electronics Level II course.
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This is a four channel amplifier ideally suited for use with quadraphonic equipment such as a Sound Blaster Live card. There is no volume control,audio levels being directly controlled from the sound card itself.
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For those who might wish to 'save' to their computer hard-drive a digital copy of their own vinyl record collection, I have redrawn my 1975 vinyl pre-amplifier circuit. It remains capable of optimising disc playback and offers features still not repeated today.
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10W Old-Style ultra-compact Combo. Two inputs - Overdrive - Treble-enhancement
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An 8 watt amplifier made with the TDA2030 IC. Built two such units for a stereo amplifier.
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Low-cut and Bass controls. Output power: 40W into 8 Ohm and 60W into 4 Ohm loads
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LF353 Wide Bandwidth Dual JFET Input Operational Amplifier
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