Free Simple Circuit Diagram
This touch tone decoder can be used to decode a DTMF (Dual Tone Multiple Frequency) signal from a telephone device or from other generator. Using the frequency values shown in the schematic diagram, this circuit decodes a standard touch tone codes. The components R1 and C1 for each 567 chip should be computed according to the formula: f=1/(1.1 *R1 *C1). […]
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This is a one transistor pump circuit. This is a very simple circuit and very helpful, you can use it as a building block for designing more complex electronic circuit. This circuit generates voltage staircase from a square wave input. Here is the circuit: The V1 is determined by following equation: V1 = Vo – Vbe(sat) If the input voltage […]
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When there is quiet passages, a tape noise becomes disturb. This noise can be reduces using Philips’ Dynamic Noise Limiter circuit. The principle operation of this circuit is improve the signal-to-noise ratio during the quite periods by decreasing the gain for the higher frequencies. However, on the higher frequency components of the signal, the effect is not significant because the […]
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A schematic diagram of a micropower single-supply instrumentation amplifier circuit is shown below. This circuit only need 15µA of current and can give over 110dB of common rejection. A single amplifier can provide differential to single-ended conversion with excellent common mode-rejection because feedback is to trim pins rather than to the inverting pin. Here is the schematic diagram of the […]
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