Free Simple Circuit Diagram
A symmetrical, 10 mV peak to peak triangle waveform can be generated by the circuit depicted in the following schematic diagram. This circuit is featured with alternative DC biased output which can be used to feed an ADC. The DC level input offsets the triangle waveform over the input range of the ADC.
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The following circuit shown in the schematic diagram converts temperature reading (from +30° to +30° F) to its corresponding frequency (30 to 3000 Hz). Other benefit is that a 4N28 isolate the output to protect the receiver from dangerous interference. We can use this circuit diagram to send temperature information across long transmissions lines because the 4N28 output voltage can […]
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Gain adjustment will be more flexible if it controlled by a voltage signal, since we can use many methods to provide user interface. We can control it by a potentiometer with anti glitch filter, or we can drive it with DAC from digital controller. On the circuit depicted in the following schematic diagram, we use silicon diodes to vary the […]
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When the source of the sound is only intermittently exist, it’s better to turn on the tape recording only when it really present. We can control a tape recorder to switch a tape recorder on when audio is present by driving an IRF511 power MOSFET and rectifying the audio input. To record intermittent transmissions such as repeater output, aircraft, etc, […]
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