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Telephone control automatic lighting circuit 1

Published:2011/4/25 4:30:00 Author:May | Keyword: Telephone control, automatic lighting

The diagram shows telephone control automatic lighting circuit. At night, when telephone rings or master takes up telephone transmitter dialing, the light can lighten; when telephone ringer stopped (no one listen) or on-hook, it can delay 10~40s, then the light can die out itself. Moreover, this circuit also set a light triggering button. The light can lighten about 40s only by pressing the button. (View)

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Telephone control automatic lighting circuit 2

Published:2011/4/25 4:37:00 Author:May | Keyword: Telephone control, automatic lighting

Telephone control automatic lighting circuit 2
The diagram shows telephone automatic light composed of NE555 time base circuit and optical coupler. At night, when you need to make a telephone call, the light can lighten itself, it can delay 10~40s after on-hook, then the light can die out itself. Moreover, this circuit also set a triggering button. Ordinarily, when you need to lighten, the light can self lighten about 1min only by pressing the button. (View)

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5GM168 "mandarin duck jump" lantern loop control with birdsong circuit

Published:2011/4/25 4:40:00 Author:May | Keyword: lantern loop control, birdsong

5GM168 mandarin duck jump lantern loop control with birdsong circuit
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Typical application circuit of 5G167 synchronous Lantern ring control integrated circuit

Published:2011/4/25 4:42:00 Author:May | Keyword: synchronous Lantern, ring control, integrated circuit

Typical application circuit of 5G167 synchronous Lantern ring control integrated circuit
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Low frequency signal generator with high performance and composed of F007

Published:2011/4/21 6:00:00 Author:Ecco | Keyword: Low frequency, signal generator , high performance

The chart shows the low frequency signal generator circuit with high performance. The circuit is characterized by a steady increase performance, high output power, low waveform distortion. It is an ideal source of low frequency measurement signal. In the figure, the op amp A and its feedback network form a typical Wien oscillator, the oscillation frequency: f0 = 1/2. The output of RCA2 connecting to the OCL complementary push-pull amplifier may improve the circuit's load capacity. Operational amplifier A1 connected as the negative half-wave amplifier, and it forms a steady negative feedback circuit by combining with W1, R4, C1, T1 and other components. Potentiometer W1 adjusts the output rate, and it is used as sampler in the feedback loop. In order to ensure small waveform distortion, generally it should make R1C1 ≥ 20πRC. The circuit output amplitude is 0.5 ~ 5V, output current is 0 ~ 1A, the frequency adjustment range is 10Hz ~ 10kHz, the output resistance is less than or equal to 0.05Ω, harmonic distortion is less than 0.1%. (View)

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The low frequency various waveforms generator(741)

Published:2011/4/22 2:58:00 Author:Ecco | Keyword: low frequency, various waveforms , generator

The low frequency various waveforms generator(741)
The chart shows a low frequency various waveforms generator circuit. The circuit can output two waveforms, the triangular wave and square wave. In the circuit, the first level is a standard integrator; second level is the inverter with gain in 1; the third level is a comparator with hysteresis. In the third stage without the diode, the circuit output is positive, the integrator output is negative syncline wave, which will be positive by reverse-phase helical wave and added to the comparator. When the ramp rate reaches the comparator threshold level Vo = R1 / (R1 + R2), the output is negative, then the integrator output is positive ramp; when its amplitude reaches the threshold level, the circuit has changed state, therefore, the first stage outputs triangle wave, the third stage outputs square wave, the phase difference between them is 180o. If adding a diode to the third level output, as the diode clamping action, the negative output of the comparator is -0.7V, then the circuit outputs sawtooth and pulse waves. Whether additional diodes, the output frequency is determined by the integrator time constant, power supply voltage and the partial pressure ratio of the comparator, its limit depends on the op amp's slew rate. The circuit limiting frequency is 5kHz. (View)

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Composed of RX-2/TX-2 4 channels wireless remote control toy car circuit diagram

Published:2011/4/20 23:02:00 Author:Rebekka | Keyword: 4 channels, wireless remote control , toy car

Composed of RX-2/TX-2 4 channels wireless remote control toy car circuit diagram
Figure (a) is the wireless transmission circuit; (b) is a wireless receiver circuit. (View)

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Remote control receiver decoder component TH9738

Published:2011/4/20 22:59:00 Author:Rebekka | Keyword: Remote control receiver, decoder component

Remote control receiver decoder component TH9738
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Appliances infrared remote control receiver circuit diagram

Published:2011/4/20 22:31:00 Author:Rebekka | Keyword: Appliances , infrared remote control, receiver

Appliances infrared remote control receiver circuit diagram
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BA5201 (household appliances) infrared remote control decoding circuit diagram

Published:2011/4/22 4:29:00 Author:Rebekka | Keyword: household appliances, infrared remote control , decoding circuit

BA5201 (household appliances) infrared remote control decoding circuit diagram

BA5201 is an infrared remote control decoding IC. It is suitable for electric fan and some other household appliances. The supporting use of it is BA5101. Here isthepinout and functions. BA pin symbol and functions. The typical application circuit. (View)