5 Frequency Responses (3 bands) Tone Control

For most audio amplifier application, this 5 frequency responses will appropriate. The frequency response variation will be flat (no modification of the input signal), bass cut, bass boost, middle cut, middle boost, treble cut, and treble boost. To comply with high fidelity standard, this circuit uses low noise audio type transistor. The flat response is set by the center position […]

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Transformerless Dc -To- Symmetric DC Converter

A DC to DC converter is needed for a board that only has +5V supply but have to provide dual-polarity supplies for few device such as op-amp or some DAC. Using switched capacitors as the main converting element (diode-capacitor voltage-doubler), there is no inductors or transformers in this circuit. This circuit also does not require dc-to-dc converter ICs but uses […]

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Flash-Triggered Pulse Stretcher Using Classic Monostable Circuit

This is a flash triggered (photo-driven) circuit which produce a pulse with constant predetermined wide. This circuit can be used to control any device which is required to be synchronized with optical trigger/flash light.  The pulse can be used to drive relay (after proper power buffering,  to drive other circuit logic, or electronic switch.  We call it a pulse stretcher […]

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