Control Circuit

Homemade multi-purpose remote control circuit

Published:2011/7/25 22:20:00 Author:Christina | Keyword: Homemade, multi-purpose, remote control circuit

This remote controller uses the miniaturization wireless remote control 4-bit special component which is produced by the XinLi electronic instrument Co., LTD, it is composed of a 4-bit buckle type transmitter, the power supply uses the A23 type 12V battery with small size. The recevier circuit is the KL668 type, the power supply is 9V DC, the voltage of the control relay is decided by the relay, the relay in this figure is 12V. This receiving circuit has strong anti-interference ability, the control distance is 20-40 miles.   (View)

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Crosstalk_tests

Published:2009/7/23 22:06:00 Author:Jessie

Figure 2-X shows a test circuit for measuring the isolation between channels (or the lack of crosstalk when the channel switches are closed) for the MAX301/3/5.Typical crosstalk isolation is 90 dB.   (View)

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FAIL_SAFE_ALARM

Published:2009/7/5 21:28:00 Author:May

Circuit monitors status of microprocessor system and energizes lamp or other alarm indicator to indicate when CPU halts or power is lost. Input is TTL-compatible, and output can drive loads up to 130 mA at 30 V.-J. Elias, Alarm Driver Is Fail-Safe, EDN Magazine, May 20, 1975, p 76.   (View)

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Off_isolation_tests

Published:2009/7/23 22:05:00 Author:Jessie

Figure 2-W shows a test circuit for measuring the isolation between channels (when the channel switch is open) for the MAX301/3/5. Typical isolation is 72 dB,   (View)

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LEAKAGE_TESTER_1

Published:2009/7/23 22:05:00 Author:Jessie

High-reliability current-detecting Schmitt trigger responds to nanoampere inputs for leakage testing of capacitors, diodes, and insulation, yet is not damaged or even affected by overloads of 1,000 v at input. Input of 300 no will trigger output relay.-P. Lefferts, Schmitt Triggers on Nanoamp Inputs, EEE, 14:6, p 91.   (View)

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Fault_tolerant_mux

Published:2009/7/23 22:14:00 Author:Jessie

Figure 2-11 shows how the MAX328/29 (Figs, 2-O, 2-P) can be converted to a fault-tolerant mux. The internal diodes limit the voltage at the input to±15.7 V (±15-V supplies). No external diodes are required. The resistors limit power dissipation to 0.28 W when a 120-Vac fault occurs. MAXIM HIGH-RELIABILITY DATA BOOK, 1993, P. 1-6.   (View)

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HT-7605 (alarm, lighting and industrial control) pyroelectric infrared receiver control circuit

Published:2011/8/1 4:21:00 Author:Christina | Keyword: alarm, lighting, industrial control, pyroelectric, infrared, receiver control

The HT-7605 is designed as the pyroelectric infrared receiver control circuit that can be used in the alarm, lighting and industrial control applications. The internal circuit is composed of the system oscillator, the delay oscillator, the voltage regulator, the operational amplifier, the voltage stabilizer, the latch circuit, the delay circuit, the zero crossing trigger circuit, the control circuit, the beep excitation circuit, the LED excitation circuit, the relay excitation circuit, the SCR excitation circuit and the testing circuit. Features Single chip type.Micro-power consumption.High integration, little external components, high sensitivity.Stable performance.   (View)

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DC_MOTOR_CONTROL

Published:2009/7/5 21:21:00 Author:May

Developed for use in realistic Iunar lander simulation display. Throttle signal and altitude signal serve as inputs to microprocessor. Feedback position-measuring pot is geared to 12-VDC motor so fuil travel of pot shaft occurs while lunar module traverses full altitude range. Circuit provides minimum drive voltage required by DC motor for motion to occur. Output of difference amplifier IC1 goes to summing amplifier IC4 as one component of final motor voltage. Comparators IC2 and IC3 sense when difference voltage is larger than small positive voltage set by R13 or smallerthan small negative voltage set by R14. Comparator output then becomes 12 V, and portion of this (about 2 V) drives motor into operating range.IC5 is high-power opamp delivering 1 A at 12 V.-L. Sweer,T. Dwyer, and M. Critchfield, Controlling Small DC Motors with Analog Signals, BYTE, Aug. 1977, p 18-20, 22, and 24.   (View)

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Bistable switch control circuit composed of the T996/998C

Published:2011/8/1 2:04:00 Author:Christina | Keyword: Bistable, switch control circuit

The T996 component is designed as the SAW type wireless remote control launch component with the digital coding circuit, the internal circuit structure of it is the same as the CS900, but it uses the PT2262 digital coding circuit. Also it is designed as the four-channel remote control transmitter, the transmitting frequency is 418MHz. The T998 component is designed as the radio receiver device that can be used with the T996, the internal circuit is the same as the CS902, but the T998 has the digital decoding circuit PT2272. The bistable switch control circuit which is composed of the T998C-6V and the dual D flip-flop trigger is as shown in figure (a). The four output ports D1～D4 of the T998C-6V control the turn of the four bistable flip-flops respectively to achieve the on-off of the channels.   (View)

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15_MINUTE_SCS_TlMER

Published:2009/7/23 22:21:00 Author:Jessie

Transistor and silicon controlled switch together serve to open relay 15 minutes after it is activated by man ual dosing of battery switch, for operating recording instruments.-T. H. Charters, Low-Cost Time Delay Controls Recorder, Electronics, 37:18, p 84.   (View)

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Negative_variable_voltage_reference_VSUBOUT_SUB_is_higher_than_reference_zener

Published:2009/7/23 22:21:00 Author:Jessie

This circuit is similar to that of Fig. 10-45, except that a variable negative-voltage reference is provided at VOUT   (View)

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16_channel_sequential_differential_mux_demux

Published:2009/7/23 22:19:00 Author:Jessie

Figures 2-18 and 2-19 show a typical application circuit and pin configurations, respectively, for the MAX7506/07. This circuit is similar to that shown in Fig. 2-17, but with 16-channel operation. MAXIM HIGH-RELIABILITY DATA Book, 1993, P. 1-49.   (View)

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8_channel_sequential_differential_mux_demux

Published:2009/7/23 22:18:00 Author:Jessie

Figures 2-16 and 2-17 show a typical application circuit and pin configurations, respectively, for the MAX7501/02/03. In this circuit, the IC acts as a multiplexer or demultiplexer by inter-changing the analog inputs and outputs. Each channel is sampled in sequence by signals from a DM7493 under the control of an external clock. MAXIM HIGH-RELIABILITY DATA Book, 1993, P.1-47.   (View)

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Minimizing_phase_distortion_

Published:2009/7/23 22:17:00 Author:Jessie

Figure 2-15 shows a circuit used to minimize phase distortion at a mux output. MAXIM HIGH-RELIABILITY DATA Book, 1993, P. 1-46.   (View)

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ZERO_CROSSING_SYNCHRONIZER

Published:2009/7/23 22:16:00 Author:Jessie

Variable-frequency sinusoidal wavetrain output, starting at zero crossing, is produced by gating circuit. Used to determine attenualion and velocity characteristics of ultrasonic delay lines. Covers 20 cps to 300 kc. External blocking oscillator allows use of alternative repetition rate generator when required.-J. A. Wereb, J., Zero-Crossing Technique Syncs Wavetrain Outputs, Electronics, 32:19, p 64-65.   (View)

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Isolating_capacitive_loads

Published:2009/7/23 22:16:00 Author:Jessie

Figure 2-14 shows a circuit used to isolate a mux output that feeds into a large capacitive load. MAXIM HIGH-RELIABILITY DATA Book, 1993, P. 1-46.   (View)

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MAGNETOSTRICTION_TV_REMOTE_CONTROL

Published:2009/7/23 22:20:00 Author:Jessie

Frequency of transistor oscillator is controlled by either of two lengths of nickel tubing, each looting inside form having two coil windings. One coil acts as driver and the other as pickup to provide feedback voltage for sustaining oscillation at control frequencies of 38.5 and 41.5 kc. Aluminum diaphragms on front ends of tubing increase acoustic output.-N. Frihart and J. Krakora, Ultrasonic Tones Select Tv Channels, Electronics, 31 :23, p 68-69.   (View)

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Sample_hold_circuit

Published:2009/7/23 22:20:00 Author:Jessie

Figures 2-20 and 2-21 show a typical application circuit and pin configuration/ switching-state, respectively, for the IH5040-IH5045/47. These general-purpose CMOS analog switches are latch-up proof, with 1-nA leakage current and less than 1-μA quiescent current. MAXIM HIGH-RELIABILITY DATA BOOK, 1993, P. 1-153.   (View)

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REMOTE_TV_VOLUME_CONTROL

Published:2009/7/23 22:19:00 Author:Jessie

Ultrasonic bursts from handheld transmitter are picked up by microphone and fed to ujt threshold detector 2N2646 that also generates trigger pulse. Two cascaded bistable dividers control three transistors shunted across volume control, to give full volume (no shunting) and three lower volume levels.-J. H. Phelps, Transistors Instead of Relays Tune TV Volume, Electronics, 37:9, p 32-33.   (View)

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4_2_differential_mux_MAX335

Published:2009/7/23 22:24:00 Author:Jessie

To use the MAX335 as a 4-X-2 differential mux, tie COMO through COM3 together and COM4 through COM7 together, Differential inputs will be at the source inputs as follows: (N00, N04), (N01, N05), (N02, N06), and (N03, N07). Figure 2-32 shows the serial input control at DIN required to turn on two switches to form a differential mux. CS is held low for four clock pulses; the first pulse is clocked into the fifth swith position as the second pulse is clocked into the first switch position. CS is pulled high to update the switches; ten CS is pulled low, and SCLK advances pulses to S1 and S5 positions, where CS is pulled high to update, etc.   (View)

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