Newest circuit diagrams
This circuit is designed to work at UHF frequencies in the range 450-800MHz. It has a gain of around 10dB and is suitable for boosting weak TV signals.
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A complete AM radio set based on the MK484 IC (formerly ZN414).
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Two simple, wide supply range operating circuits.
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A stereo line driver for feeding long cables or buffering an audio source.
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This circuit can be used to remotely monitor a loudspeaker, alarm, or audio source for presence of an audio waveform. It can also be directly connected across loudspeaker terminals used as a peak indicator.
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A classic Wien Bridge oscillator using an Op-Amp covering a frequency range of 15 to 150kHz in four switched steps.
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Acoustic check of transistor and diode junctions. Also suitable as continuity tester.
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A 2 Watt audio amplifier made from discrete components.
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This circuit uses the Holtek HT2884 IC to produce 8 different sound effects.
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An audio amplifier made from discrete components with 2 Watts audio power into an 8 ohm load. Carlos has used this amplifier on his AM radio for many years.
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