Free electronic circuit design and schematic diagram
This is circuit of Clap Triggered Switch. When the circuit detects tap, or short whistle or a clap, this circuit will toggle the LEDs. 33k and 5K6 charge The second 10u. The negative excursion of the waveform takes the positive end of the 10u towards the 0v rail, when a sound is detected. the two 1N4148 diodes will be pulled […]
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This is Auto OFF Light circuit. After the switch is pressed, the bulb is kept illuminated for a few seconds. To increase the “ON” time, The 10k should be replaced by 100k. Here is the circuit: You can use this delayed auto-off lamp circuit to give temporary lighting for your stairway, or your dashboard, your bookshelf, or many more.
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The LED to flash 5 times per second if the unit is brought close to a live conductor (insulated, and even buried in plaster) capacitive coupling between the live conductor and the probe clocks the counter. That’s caused the 4017 IC divides the mains 50Hz frequency by 10. The unit stops counting, the LED resulting permanently OFF (or permanently ON […]
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Anti-log or exponential generation is simply a matter of rearranging the logarithmic circuitry. The circuit diagram below shows the circuitry of the log converted to generate an exponential output from a linear input. The emitter of Q2 in proportion to the input voltage is driven by amplifier A1 in conjunction with transistor Q1. The collector current of Q2 varies exponentially […]
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This is Fast Logarithmic Amplifier circuit. Dynamic range of This circuit has is 80 dB. This circuit is configured to optimize speed rather than dynamic range. To allow the use of feed forward compensation1 on an LM101A operational amplifier, this circuit uses Transistor Q1 that is connected with diode. This compensation can increase the slew rate and extends the bandwidth […]
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We can generate easily many non-linear functions such as X^1/2, X^2, X^3, 1/X, XY and X/Y using logs. Division becomes subtraction, multiplication becomes addition and powers become gain coefficients of log terms. The circuit diagram below shows a circuit whose output is the cube of the input. Actually, by changing the values of R9 and R10 in accordance with the […]
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This is a circuit of Log Converter with 100dB Dynamic Range. This circuit can give a a logarithmic output voltage for a linear input current. This circuit use an LM108 operational amplifier with Transistor Q1 as non-linear feedback element. R1 and R2 are used as divider. Negative feedback is applied to the emitter base junction of Q2 and the emitter […]
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