Circuit Diagram

Digitally_programmed_set_point_comparator

Published:2009/7/21 3:04:00 Author:Jessie

Digitally programmed set point comparator (courtesy Analog Devices, Inc.).   (View)

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10_GHz_SINGLE_STAGE_PREAMP

Published:2009/7/8 22:45:00 Author:May

Using a single Avantek ATF 13135 GASFET, this preamplifier has 8-dB gain (typically)and1.7-dB nolse figure.The PC boardis 0.031'',doublesided,with E=2.2.   (View)

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AD_BOARD

Published:2009/7/8 22:44:00 Author:May

An IBM PC can operate the two 12-bit A/D converters in Fig. 1 via its printer port. The converters' serial outputs use only two of the printer port's eight data lines (DATA A OUT, DATA B OUT). Because the IBM PC's printer port supplies no power, interface software running on the PC programs the six unused data lines high. Busing these data lines provides power for the digital portion of the A/D con-verters. (The converters have internal optoisolators. Consequently, you must provide isolated supplies for their analog sides.) Although the converters can execute 12-bit conversions in 6 μs, the slow software-driven approach used in this Design Idea stretches conversion periods out to about 100 μs (depending on your PC's clock speed). The circuit takes advantage of the converters' optoisolator inputs to put their clock and start inputs in series. Therefore, the converters operate synchronously. The accompanying software starts the conversions, issues clock pulses, reads the data bits as they become available, and stores them in memory. The listing is too long to reproduce here; you can obtain it from the EDN BBS (617-558-4241, 2400, 8, N, 1).   (View)

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ADJUSTABLE_DUTY_CYCLE_SQUARE_WAVE_OSCILLATOR

Published:2009/7/21 3:04:00 Author:Jessie

Use R5 to adjust this variable-duty-cycle square-wave generator. That potentiometer controls I2 to vary the timing.   (View)

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AMBIENT_LIGHT_GNORING_OPTICAL_SENSOR

Published:2009/7/8 22:44:00 Author:May

A resonance-tuned narrow-band amplifier reduces this optical object detector's sensitivity to stray light. C1 and L1 in IC2A's feedback loop cause the op amp to pass only those frequencies at or near the LED's 5-kHz modulation rate. IC2B's output increases when the received signal is sufficient to drop the negative voltage across C2 below the reference set by R2.   (View)

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FAST_RESPONSESETTLINGLOW_PASS_FILTER

Published:2009/7/8 22:44:00 Author:May

This circuit uses a Wien Bridge and variable negative feedback. R7 controls the gain and R8A and R8B controls the tuned frequency.   (View)

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LJC2200 (air conditioner, electric fan, radio, television and toy) infrared, ultrasonic and radio remote control receiving circuit

Published:2011/7/27 22:03:00 Author:TaoXi | Keyword: air conditioner, electric fan, radio, television , toy, infrared, ultrasonic, radio, remote control, receiving circuit

The LC2200 is designed as the infrared, ultrasonic and radio remote control receiving circuit that can be used in the air conditioner, electric fan, radio, television and toy applications. The internal circuit is composed of the input buffer circuit, the fault detection circuit, the timing circuit, the decoder, the boot-reset circuit, the mode control circuit, the latch and output driver circuit. Features Low power consumption.Good anti-interference performance.Little external components.Easy to use.The matching model is LC2190.   (View)

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INDICATOR_LAMP_DRIVER

Published:2009/7/8 22:43:00 Author:May

A simple solid-state relay circuit drives the 10-Vac telephone indicator lamps from logic circuitry, while maintaining complete isolation between the 10-V line and the logic circuit.   (View)

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LB1475 (video tape recorder) two-wire wired remote control circuit

Published:2011/7/27 22:15:00 Author:TaoXi | Keyword: video tape recorder, two-wire, wired, remote control circuit

FeaturesYou can complete 13 kinds of remote control functions by using only two control lines between the controller and the remote control equipment. It has the monostable multivibrator, the oscillation frequency is controlled by the external components, and this monostable multivibrator can be used to inhibit the disturbance which is produced by the switch conversion; when you do not want to use the monostable multivibrator, you can connect the pin-16 with the ground. It can drive the light-emitting diode directly. 20-pin dual-row DIP package.   (View)

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NORMALLY_OPEN_AND_NORMALLY_CLOSED_DC_SOLID_STATE_RELAYS

Published:2009/7/8 22:42:00 Author:May

The phototransistor and photodarlington couplers act as dc relays in saturated switching at currents up to 5 mA and 50 mA, respectively. When higher currents or higher voltage capabilities are required, additional devices are required to buffer or amplify the photocoupler output. The addition of hysteresis to provide fast switching and stable pick-up and drop-out points can be easily implemented simultaneously.These circuits provide several approaches to implement the dc relay function and serve as practical, costeffective examples.   (View)

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LM909 (electronic toys) radio remote control receivier decoding circuit

Published:2011/7/28 0:53:00 Author:TaoXi | Keyword: electronic toys, radio, remote control, receivier, decoding circuit

The LM909 is designed as the radio remote control receivier decoding circuit that can be used in the electronic toys application. The circuit is composed of the radio frequency amplifier, the automatic gain control (AGC) circuit, the wave detector, the phase locked loop, the level detection circuit and the push-pull output circuit. Features The decoding frequency is 40MHz.The RF sensitivity is high.It has the audio PLL demodulator.The automatic gain control range is wide.The surge output current is 1A, the continuous operating current is 0.6A.The power supply voltage range is wide (5-14V).It has the voltage-stabilized power supply.   (View)

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Square_rooter_circuit_using_an_AD532_multiplier_divider_chip

Published:2009/7/21 4:35:00 Author:Jessie

Square rooter circuit using an AD532 multiplier/divider chip. The AD532 is available as a 10-pin TO-100 or as a 14-pin DIP (courtesy Analog Devices,Inc.).   (View)

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57_GHz_MICROWAVE_AMPLIFIER

Published:2009/7/8 22:41:00 Author:May

This preamplifier has a typical gain of 17 dB and NF=1.2 dB or better. If a 0.031 PC board (with a dielectric constant of 2.2) is used, the reverse side is unetched.   (View)

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A_ONE_TRANSISTOR_FM_TRANSMITTER

Published:2009/7/8 22:40:00 Author:May

The 2N2222 circuitry is a three-element, phase-shift oscillator circuit, designed to yield a 1,000-Hz sine wave. The 1,000-Hz sine wave is then applied to the TCG-610 varactor diode, 6 pF at 4 V, which changes the tank capacitance, thus varying the rf oscillator frequency at a 1,000-Hz rate. The 1,000-Ω potentiometer in the collector circuit can be adjusted to enable the desired frequency modulation level.The Hartley rf oscillator, designed around a readily available MPF-102 JFET, has an output that should be relatively stable if it is enclosed in a metal box, thus minimizing changes in tank capacitance. The completed transmitter has a range of 30 feet when not enclosed-without an antenna.   (View)

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LM1872 (electronic toys and model cars) radio, infrared ray remote control receiving decoder circuit

Published:2011/7/28 1:08:00 Author:TaoXi | Keyword: electronic toys, model cars, radio, infrared ray, remote control, receiving, decoder circuit

The LM1872 is designed as the radio or infrared ray remote control receiving decoder circuit that can be used in the electronic toys and model cars. The internal circuit is composed of the logic unit circuit, the local oscillator, the voltage regulator, the intermediate frequency circuit, the AGC circuit, the wave detector and the synchronous circuit. Features The function is complete.The external components is few.The operating frequency is wide (50kHz-72MHz).The specialized superheterodyne type design supplies the high selectivity and sensitivity.It has good power supply noise rejection capability.It connects with the standard spare servo mechanism directly.The matching model is LM1871.   (View)

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NORMALLY_CLOSED_HALF_WAVE_zvs_CONTACT_CIRCUIT

Published:2009/7/8 22:39:00 Author:May

A normally closed contact circuit that provides zero-voltage switching is designed around the 4N39 SCR optocoupler. The circuit illustrates the method of modifying the normally open contact circuit by using the photo SCR to hold off the trigger SCR.   (View)

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WIDEBAND_ACTIVE_ROD_ANTENNA

Published:2009/7/8 22:36:00 Author:May

A J309 Siliconix FET feeds a 2N5109 in a wideband RF amplifier configuration. A relay is used to bypass the amplifier in the transmit mode (if desired). A 2-m 5/8-wave whip is used as the active antenna element. The amplifier is fed dc via the coax cable, which makes the use of only a single coax lead for both signal and power. U1 is a surge arrester for electrostatic discharge protection.   (View)

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M50116P/AP/BP/CP （video recorder, TV and audio equipment) 60-function infrared remote control receiving circuit

Published:2011/8/1 4:57:00 Author:TaoXi | Keyword: video recorder, TV, audio equipment, 60-function, infrared, remote control, receiving circuit

The M50116P/AP/BP/CP is designed as the 30-function infrared remote control receiving circuit that can be used in the video recorder, TV and audio equipment applications. The internal circuit is composed of the receiving signal input circuit, the demodulator, the receiving state discriminant circuit, the oscillator, the timing signal generator, the malfunction prevention circuit, the serial processing circuit, the shifting register and the automatic reset circuit. The differences between the M50116P, M50116AP, M50116BP, M50116CP are the identification numbers. Features CMOS large scale integrated circuit, the power consumption is low.When it uses the single power operating mode, the power voltage is 4.5-8V.The high sensitivity, fast receiving speed.18-pin dual-row DIP plastic package.The matching models are M50116P, M50116AP, M50116BP, M50116CP and M50115P, M50115AP, M50115BP, M50115CP.   (View)

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M50117F/AP/BP/CP (VCR, TV and audio equipment) 120-function infrared remote control receiver circuit

Published:2011/8/1 5:01:00 Author:TaoXi | Keyword: VCR, TV, audio equipment, 120-function, infrared, remote control, receiver circuit

The M50117F/AP/BP/CP is designed as the 120-function infrared remote control receiving circuit that can be used in the video recorder, TV and audio equipment applications. The internal circuit is composed of the receiving signal input circuit, the demodulator, the receiving state discriminant circuit, the oscillator, the timing signal generator, the malfunction prevention circuit, the serial processing circuit, the shifting register and the automatic reset circuit. The differences between the M50117P, M50117AP, M50117BP, M50117CP are the identification numbers. Features CMOS large scale integrated circuit, the power consumption is low.When it uses the single power operating mode, the power voltage is 4.5-8V.The high sensitivity, fast receiving speed.18-pin dual-row DIP plastic package.The matching models are M50110P, M50110AP, M50110BP, M50110CP and M50115P, M50115AP, M50115BP, M50115CP.   (View)

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M50111P/AP/BP/CF (video recorder, television and audio equipment) 30-function infrared remote control receiver circuit

Published:2011/8/1 5:04:00 Author:TaoXi | Keyword: video recorder, television, audio equipment, 30-function, infrared, remote control, receiver circuit

The M50111P/AP/BP/CF is designed as the 30-function infrared remote control receiving circuit that can be used in the video recorder, TV and audio equipment applications. The internal circuit is composed of the receiving signal input circuit, the demodulator, the receiving state discriminant circuit, the oscillator, the timing signal generator, the malfunction prevention circuit, the serial processing circuit, the shifting register and the automatic reset circuit. The differences between the M50117P, M50117AP, M50117BP, M50117CP are the identification numbers. Features CMOS large scale integrated circuit, the power consumption is low.When it uses the single power operating mode, the power voltage is 2.2-8V.The high sensitivity, fast receiving speed.16-pin dual-row DIP plastic package.The matching models are M50110P, M50110AP, M50110BP, M50110CP.   (View)

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