Circuit Diagram

60_Hz_NOTCH_FILTER

Published:2009/7/2 5:10:00 Author:May

Design is based on passband gain of 3 and O of 6. Resistors can be 5%.Opamps can be 741. Notch response is obtained by subtracting output signal of bandpass filter from its input signal whh R6.-H, M. Berlin, Design of Active Filters, with Experiments, Howard W. Sams, Indianapolis, IN, 1977, p 155.   (View)

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HIGH_LEVEL_ACTIVATION_BY_CMOS

Published:2009/7/2 5:07:00 Author:May

High output of tpical CMOS gate drives complementary MPS-A13 Darlington transistor having80-mA lamp load.-A Pshaenich, InterfaceTechniques Between Industrial Logic and Power Devices,| Motorola,Phoenix,AZ,1975,AN-712A,p 11   (View)

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TTL_TO_CMOS_TRANSLATOR

Published:2009/7/2 5:03:00 Author:May

Two sections of Harris HA-4900/4905 precision quad comparator provide intelface between TTL drive and CMOS output circuits. Supply is±15 V.- Linear & Data Acquisition Products, Hatris Semicon-ductor, Melboume, FL, Vol. 1, 1977, p 2-95.   (View)

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LOGIC_PROTECTOR

Published:2009/7/2 5:00:00 Author:May

Simple bidirectional triac crowbar can be set so positive voltages above 6 V and negative voltages greater than 1.5 V cannot reach digital logic. Article covers initialadjustment of R2、-D L,Spome,Bidirectional Crowbar Protects Logic,EDN Magazine．Dec15,1970,p37   (View)

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10_kH_GYRATOR

Published:2009/7/2 4:58:00 Author:May

Active filter circuit uses two sections of CA3060 three-opamp array as gyrator that makes 3-μF capacitor function as fioating 10-kilohenry inductor across terminals A and B, Q of inductor is 13. l00k pot tunes inductor by changing gyration resistance.- Linear Integrated Circuits and MOS/FET's, RCA Solid State Division, Somerville, NJ, 1977, p 152.   (View)

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HV_REGULATOR_WITH_FOLDBACK_CURRENT_LIMITING

Published:2009/7/2 4:57:00 Author:May

Circuit NotesA TMOS MTM7N45 (Q2) is used as a series pass element in a linear high voltage supply that accepts +275-V unregulated and produces 250 V regulated with foldback current limiting.A 15-V zener, D1, provides the dc reference for operational amplifier U1, whose other input is obtained from a fraction of the output voltage. UI drives Q3, which drives the gate of Q2. Foldback current limiting is achieved by RI, R2, R3, R4, Q1, and D2. The formula to estab!ish the current knee for limiting is:   (View)

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15_kHz_NOTCH

Published:2009/7/2 4:57:00 Author:May

Unity-gain state-variable filter consists of low-pass and high-pass sections combined with two-input summing amplffierto give notch response for suppression of 1.5-kHz signals. Opamps can be 741.-H. M. Berlin, Design of Active Filters, with Experiments, Howard W. Sams, Indianapolis, IN, 1977, p 186-189.   (View)

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GLOW_PLUG_DRIVER

Published:2009/7/2 4:56:00 Author:May

Model airplanes, boats, and cars use glow plug ignitions for their miniature (0,8cc to 15cc) internal combustion engines. Such engines dispense with the heavy on-board batteries, H.T. coil, and condenser required for conventional spark ignition, while simultaneously developing much higher RPM (hence power) than the compression ignition (diesel) motors. The heart of a glow plug is a platinum alloy coil heated to incandescence for engine starting by an external battery, either 1.5 volts or 2 volts. Supplementing this battery, a second 12-volt power supply is frequently required for the engine starter, together with a third 6 volt type for the electrical fuel pump.Rather than being burdened by all these multiple energy sources, the model builder would prefer to carry (and buy) a single 12-volt battery, deriving the lower voltages from this by use of suitable electronic step-down transformers (choppers). The glow driver illustrated does this and offers the additional benefit of (through negative feedback) maintaining constant plug temperature independent of engine flooding, or battery voltage while the starter is cranking.In this circuit, the PUT relaxation oscillator Q1 turns on the output chopper transistor Q2 at a fixed repetition rate determined by R1 and C1. Current then flows through the glow plug and the parallel combination of the current sense resistor R2 and the LED associated with the H11L Schmitt trigger. With the plug cold (low resistance), current is high, the H11L is biased on , and Q3 conducts to sustain base drive to Q2. Once the plug has attained optimum operating temperature, which can be monitored by its ohmic resistance, the H11L is programmed (viaRP).to switch off, removing base drive from Q3 and Q2.However, since the H11L senses glow plug current, not resistance, this is only valid if supply voltage is constant, which is not always the case. Transistor Q4 provides suitable compensation in this case; if battery voltage falls (during cold cranking, for instance), the collector current of Q4 rises, causing additional current to flow through the LED, thus delaying the switch-off point for a given plug current. The circuit holds plug temperature relatively constant, with the plug either completely dry or thoroughly wet , over an input voltage range of 8 to 16 volts. A similar configuration can be employed to maintain constant temperature for a full size truck diesel glow plug (28-volts supply, 12-volts glow plug); in this case, since plug temperature excursions are not so great, a hysteresis expansion resistor RH may be required.   (View)

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MODULATOR_CONTROL_FOR_FULL_WAVE_SCR_SWITCH

Published:2009/7/24 2:26:00 Author:Jessie

Used with high-power a-c scr switching circuit to provide regulation by varying ratio of full on cycles to full off cycles of supply voltage. Also suitable for oven and furnace temperature control, motor control, and flashers. With R10 at 10K, variaion of R11 from zero to maximum produced 40:1 load voltage swing.-F. W. Gutzwiller, RFI-Less Switching with SCRs, EEE, 12:3, p 51-53.   (View)

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700_Hz_STATE_VARIABL_E

Published:2009/7/2 4:55:00 Author:May

Provides voltage gain at center frequency of 100 (40 dB) and Q of 50. Used when simultaneous low-pass, high-pass, and bandpass output responses are re quired. Cutoff frequency of low-pass and high-pass responses is equal to center frequency of bandpass response. Opamps can be 741. Based on use of 5% resistors.-H. M. Berlin, Design of Active Filters, with Experiments, Howard W.Sams,Indianapolis, IN, 1977, p 184-187.   (View)

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PULSE_COMPLETING_SCHMITT

Published:2009/7/2 4:55:00 Author:May

Half of 7413 dual four-input NAND Schmitt trigger forms RS bistable which ensures that cycle is completed after switch is opened. Low-impedance exponential sawtooth output is produced at point C.Point A is high when oscillator is running and can be used as control signaL-T. P. Hopkins, Improved Schmitt Trigger Oscillator, Wireless World, Jan. 1978, p 58.   (View)

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ATTACK_CONTROL_AMPLIFIER

Published:2009/7/24 2:22:00 Author:Jessie

Used with tone timbre generator to provide gradual attack for electronic music demonstration.-W. S. Pike and C. N. Hoyler, Synthesizing Timbre for Electronic Musical Tones, Electronics, 32:22, p 92-94.   (View)

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5_kHz_SERIES_SWITCHED_BANDPASS

Published:2009/7/2 4:54:00 Author:May

N-path filter having N of 4,Q of 500, and voltage gain of 2 uses DG5O9 four-channel CMOS differential multiplexer having necessary pairs of analog switches and decode logic. Dual D flip-flop generates 2-bit binaly sequence from 20-kHz clock signal. Bandwidth is about 10 Hz for 3 dB down, centered on 5 kHz.- Analog Switches and Their Applications, Siliconix, Santa Clara, CA, 1976, p 5-15-5-17.   (View)

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Regulator_with_logic_output_on_dropout_battery_low

Published:2009/7/24 2:21:00 Author:Jessie

This circuit produces a logic-1 output when the regulator begins to drop out (battery low). The logic-1 signal can be used to alert a processor (or similar circuit) that power is about to go down.   (View)

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PRECISION_WELD_INTERVAL_TIMER

Published:2009/7/24 2:21:00 Author:Jessie

Stable timer provides intervals repetitive to accuracy of 0.75%, from 1 to 110 sec in 1-sec increments. Can be used for welder, enlarger, and other industrial controls.-J. Markus and V. Zeluff, Handbook of Industrial Electronic Control Circuits, McGraw-Hill, New York, 1956, p 292.   (View)

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AF_NOISE_LlMlTER_1

Published:2009/7/2 4:54:00 Author:May

Operation is similar to that of delay line. Voltage developed across voltage divider at output of 1N34 germanium diode is instantaneous, while DC voltage at output of circuit is delayed. If no pulses are present and 0.1-μF capacitor is not at ground, 1N914 silicon diode will have floating voltage. High positive pulses charge capacitor, and silicon diode shorts audio voltage. Negative pulses disable germanium diode directly. Circuit thus acts as noise blanker in both directions. Used in European communication receivers. Transistor type is not criticaL-U. L. Rohde, IF Amplifier Design. Ham Radio, March 1977. p 10-21.   (View)

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AF_NOISE_LlMlTER

Published:2009/7/2 4:53:00 Author:May

Operation is similar to that of delay line. Voltage developed across voltage divider at output of 1N34 germanium diode is instantaneous, while DC voltage at output of circuit is delayed. If no pulses are present and 0.1-μF capacitor is not at ground, 1N914 silicon diode will have floating voltage. High positive pulses charge capacitor, and silicon diode shorts audio voltage. Negative pulses disable germanium diode directly. Circuit thus acts as noise blanker in both directions. Used in European communication receivers. Transistor type is not criticaL-U. L. Rohde, IF Amplifier Design. Ham Radio, March 1977. p 10-21.   (View)

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175_MHz_10_W_amplifier_12_V_supply

Published:2009/7/24 2:21:00 Author:Jessie

The electrical characteristics for the 2N4427 shown in this given in Fig．2-16B.   (View)

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1_kHz_STATE_VARIABLE_WITH_Q_OF_1O

Published:2009/7/2 4:53:00 Author:May

Use of all four sections of Harris HA-4602/4605 quadopamp glves four types of 1－kHz second-order filtering simultaneously.Pot adjustments permit matching of various RC products allowing for noninteractive adjustment of Q and center frequency.- Linear & Data Acquisition Products, Hamis Semiconductor, Melbourne, FL,vol，1,1977,p 2-84.   (View)

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10_20_kHz_BANDPASS

Published:2009/7/2 4:51:00 Author:May

Two CD4047A lowpass filters, one connected for 10-kHz cutoff and other for 20-kHz cutoff, drive CD4013A flip-flop.If output of filter 2 is delayed by C, flip-flop clocks high only when input pulse frequency exceeds 10-kHz cutoff of filter 2. Waveforms show performance when input signal is swept through passband.- CQS/MOS Integrated Circuits, RCA Solid State Division, Somerville, NJ,1977,p 619.   (View)

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