Circuit Diagram

LM567 Selected frequency FM and demodulation application circuit diagram

Published:2011/4/12 4:35:00 Author:Rebekka | Keyword: Selected frequency FM , demodulation application

Figure(A) shows the selected frequency application circuit of LM567.Figure(A) shows the FM application circuit of LM567.Figure(A) shows the demodulation application circuit of LM567.   (View)

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LM567 internal structure circuit diagram

Published:2011/4/12 4:31:00 Author:Rebekka | Keyword: internal structure

LM567 is an audio decoding circuit. The internal structure circuit diagram is shown as above.   (View)

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S9803 Drive relay circuit diagram

Published:2011/4/12 4:37:00 Author:Rebekka | Keyword: Drive relay

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Noise generator with various sounds composed of HT2880

Published:2011/4/12 0:52:00 Author:Ecco | Keyword: Noise generator , various sounds

This circuit can produce eight kinds of sounds, that are two kinds of guns' sounds, two bomb sounds, dual-tone melody, the game sound, animal sounds and the sound of rifles. The eight sounds can be played by rotary switch S2 and button switch. HT2880 is a CMOS LSI's ROM chip. In the circuit, the transistors VT1 and VT2 connects as Darlington tubes, they are used as forecast the output signal of pins.   (View)

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LED voltage measurement circuit

Published:2011/4/7 1:36:00 Author:Nicole | Keyword: LED, voltage measurement

This circuit uses LED to indicate four different level class voltage, the RS339 is four comparators. When the input voltage is outstripping one comparator's reference voltage, then this comparator and the other comparators below it are all output low level, the relevant LED is lightening, indicated the high and low of input voltage. As voltage reference point, LED1 is zero point voltage indication LED, and it is always conduction.   (View)

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Negative resistance LED oscillation circuit

Published:2011/4/10 22:38:00 Author:Nicole | Keyword: negative resistance, LED, oscillation

This circuit can cover 3.2~8.0 kHz frequency range. It can inspire the loudspeaker which is connected on X point. In oder to obtain lower frequency and large sound, it should change C1 into 1μF. The negative resistance part of this circuit consists of Q1, Q2, LED, R2 and R3. Optical isolator device is MCF-2 or equivalent component.   (View)

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Constant voltage source with 5A load current

Published:2011/4/10 22:56:00 Author:Nicole | Keyword: constant voltage source

Adopted operation amplifier can obtain constant voltage source with high amplification factor and large load current, when the circuit parameter has great change, the output voltage still have high precision. The output current limit is undertaken by T3, T4 and positive feedback circuit which is composed of operation amplifier. The technical parameters of this circuit: input voltage: UE=7~18V; maximum output voltage: Umax=UE-2V; maximum load current: Imax=5A.   (View)

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Double functions water quality detection circuit

Published:2011/4/11 1:39:00 Author:Nicole | Keyword: double functions, water quality detection

The circuit adopts LM324. Adjusting W1 to make the output voltage of A1 change with light intensity between 0~4V. Probe T is two sheetmetals, put them into water, the resistance between them will change with the quantity of ions in water, A2 output changes too, it is adjusted by W2. A3, A4 form window comparator, W3, W4 decide window range. When VA4-<VA3+, VB<VA4-, F is 0 , E is 1 , D4 is red light; when VA4-<VB<VA3+, E=F= 1 , D is orange light; when VA3+<VB, E= 0 , F= 1 , D4 is green light.   (View)

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Thyristor drive LED flashing circuit

Published:2011/4/11 2:08:00 Author:Nicole | Keyword: thyristor, LED

The oscillator which is composed of unijunction transistor Q1 will produce a series of timing pluse triggering thyristor, and then the thyristor drives red LED. When the flash speed is 12/s, the work current is only 2mA.   (View)

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Solenoid safety switch circuit

Published:2011/4/11 2:36:00 Author:Nicole | Keyword: solenoid, safety switch

When the switch teleprinter is inductive load, optical isolator provides teleprinter, 8080A or other microprocessors with protection transit. RC filter with darlington transistor pair accelerates the reset of printing magnet.   (View)

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Amateur production inverter circuit application diagram

Published:2011/4/12 0:43:00 Author:Nicole | Keyword: amateur production, inverter

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Amateur precision steady voltage circuit

Published:2011/4/12 0:45:00 Author:Nicole | Keyword: steady voltage

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Remote control turn-off integrated regulated power supply

Published:2011/4/12 0:48:00 Author:Nicole | Keyword: remote control, regulated power supply

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Pocket switch power supply charger circuit BQ2057

Published:2011/4/12 3:12:00 Author:Nicole | Keyword: switch power supply, charger

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Sound control AC voltage regulator circuit

Published:2011/4/12 3:20:00 Author:Nicole | Keyword: sound control, AC voltage regulator

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Parallel regulated power supply composed of LM109

Published:2011/4/12 3:35:00 Author:Nicole | Keyword: regulated power supply

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Trimming bistable regulated power supply composed of LM109, LM120

Published:2011/4/12 3:41:00 Author:Nicole | Keyword: regulated power supply

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-10V, 1A regulated power supply composed of LM105 integrated regulator, LM195 power transistor

Published:2011/4/12 3:44:00 Author:Nicole | Keyword: regulated power supply, integrated regulator, power transistor

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110V regulated power supply

Published:2011/4/12 3:51:00 Author:Nicole | Keyword: regulated power supply

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Micro-power polarity reversal circuit diagram composed of MAX1721

Published:2011/4/2 4:34:00 Author:Nicole | Keyword: Micro-power polarity reversal

As shown, micro-power polarity reversal composed of miniature (SOT23 package) inverting charge pump IC MAX1721. This circuit just need take a 0.33μF little capacity, small size capacitor on the outside of MAX1721, then the polarity reversal can be completed, that is the output voltage Vo =- Vi.   (View)

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