Free Simple Circuit Diagram
In hybrid system, analog system with digital control, a voltage controlled things is very important since it can be interfaced by DAC from digital system. For radio tuning with digital control, a voltage controlled LC circuit is needed. If we can turn a knob of variable capacitor mechanically, microcontroller system prefer outputting a voltage rather than controlling a variable capacitor […]
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Diode and capacitor can be used to clamp an AC signal, shift the level into positive region for all cycle. Sometimes this condition is needed, to have positive state at all time, for example in some analog-to-digital conversion. At first of its operation, when the signal is in a direction diode forward, the capacitor is charged until the peak level […]
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Zener diode has been commonly used as signal limiter. With a single diode and a resistor, the limiter will limit the half cycle of a signal to it’s forward bias and and the other half cycle to its reverse breakdown voltage. Using two back-to-back Zener diodes, the limiter will now limit full cycle symmetrically. In audio application, limiting an audio […]
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Below is a cheap high fidelity (hi-fi) tone control circuit. This circuit has one channel (mono) control and we need to build another similar circuit to make it stereo. For better sound quality output, use good component (such as metalfilm resistors, MKM capacitors, tantalum capacitors, good cable quality) and stabilized power supply. The power supply, cabling and quality of component […]
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