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555 Circuit

Index 31

The adjustable symmetric triangular wave generator(NE555)

Published:2011/6/14 0:52:00 Author:Borg | Keyword: symmetric, triangular wave generator

The adjustable symmetric triangular wave generator(NE555)
In the circuit, the timer NE555 forms a triangular wave generator, whose working frequency can reach 100KHz or so. The transistors Q1 and Q2 in the figure form a switch constant current power supply whose state is controlled by Q3. When Q3 is conducting, the collector electrode is in the low LEV, at the moment, Q1 is conducting and charging the capacitor C with the constant current of i1, the voltage on the two terminals of C is a linear slope wave. When the two terminals of capacitor C are in a voltage of 2E/3 (the high trigger LEV of the timer), the 3-pin of the timer is in a low LEV, Q3 is blocked and the collecting electrode is in a high LEV. (View)

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The S amplifier and encoding signal process logic circuit of the MC3373 infrared remote receiver

Published:2011/6/18 3:00:00 Author:Seven | Keyword: amplifier, encoding signal process, infrared remote receiver

The S amplifier and encoding signal process logic circuit of the MC3373 infrared remote receiver
the logic frame diagram MC3373 logic frame diagram (View)

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The temperature/pulse width converter circuit of 555

Published:2011/6/13 23:38:00 Author:Borg | Keyword: temperature/pulse width converter

The temperature/pulse width converter circuit of 555
(View)

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The voltage/frequency converter circuit of linear sawtooth wave (555)

Published:2011/6/13 23:37:00 Author:Borg | Keyword: voltage/frequency converter, linear sawtooth wave

The voltage/frequency converter circuit of linear sawtooth wave (555)
(View)

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The digit/time converter circuit of 555

Published:2011/6/13 23:35:00 Author:Borg | Keyword: digit/time converter

The digit/time converter circuit of 555
(View)

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The linear voltage/frequency converter circuit of 555 (4)

Published:2011/6/13 23:34:00 Author:Borg | Keyword: voltage/frequency converter

The linear voltage/frequency converter circuit of 555 (4)
(View)

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Notch filter with variable Q circuit

Published:2011/6/21 0:53:00 Author:John | Keyword: Notch filter

Notch filter with variable Q circuit is shown. (View)

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LM387 voice filter circuit

Published:2011/6/15 5:08:00 Author:John | Keyword: voice filter

LM387 voice filter circuit
Serial voice filter with a range of voice frequency circuit is shown in the following figure. And its frequency ranges from 360Hz to 3KHz. (View)

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Fourth-order low-pass filter circuit

Published:2011/6/15 10:24:00 Author:John | Keyword: Fourth-order low-pass filter

Fourth-order low-pass filter circuit
The figure shows a circuit which uses a high-level low-pass filter composed of a piece of LM348 four-operational amplifier. For example, if fc = 20kHz, filter transferring coefficient is counted as H0 = 1, Q01 = 0.541, Q02 = 1.306. Only one current source (LM334Z) is needed to be equipped with the filter because this filter can lead to the same product calculation for four amplifiers within band-pass amplification factor. Potentiometers RP can be used for precision adjustment. (View)