Newest circuit diagrams
The simplicity of this circuit uses just two components, but with just one resistor and an LED this circuit gives visual indication of when a fuse has blown.
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A simple test circuit to fault find audio and radio equipment. Can be used to inject a square wave signal, rich in harmonics, or used with headphones as an audio tracer.
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An amplifier to drive low to medium impedance headphones built using discrete components.
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I have teamed up with Magazine Mikro Elektronica for this project. Please visit their site. I am very grateful to Aleksandar Dakic for the kind translation into Serbian and Romanian languages.
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Suitable for any Infra-red emitting device, 3V battery supply
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This is a compact three transistor, TRF receiver with fixed feedback. It is similar in principle to the ZN414 which is now replaced by the MK484. The design is simple and sensitivity and selectivity of the receiver are good.
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Ultra-low current drawing 1.5V battery supply
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Beeps 7.5 seconds after a preset time Adjustable time settings: 15 s. 30 s. 1 min. 2 min. & others
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Using a single MOSFET Op-amp this circuit samples the audio input and displays peak readings.
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This timer was designed mainly to switch off a portable radio after some time: in this way.
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