Circuit Diagram

Continuous_indicator_using_an_LM3909_chip

Published:2009/7/19 23:53:00 Author:Jessie

Continuous indicator using an LM3909 chip. Circuitry inside dashes is the LM3909. The circuit actually flashes at a 2 kHz rate, which cannot be detected by the human eye. This indicator is not intended as a long life system since current drain is 12 mA (courtesy National Semiconductor Corporation).   (View)

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COMPOUND_OP_AMP

Published:2009/7/10 1:28:00 Author:May

By using an emitter-follower or a Darlington pair, a voltage-follower op amp configuration can source higher currents than the op amp otherwise could.   (View)

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FLAT_TV_GENERATOR_MODULATOR

Published:2009/7/19 23:52:00 Author:Jessie

R-C gen erator V1, generating one of nine differ. ent carrier frequencies, feeds defection plate of beam deflection tube V2, while video modulation from camera is fed to grid 1 of V2 to modulate the carrier.-B. Binggeli and E. Fatuzzo, Solid-State Panels: Will They Bring Flat-Display TV?, Electronics, 35:26, p 67-70.   (View)

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WIEN_BRIDGE_OSCILLATOR

Published:2009/7/10 1:28:00 Author:May

This complex oscillator circuit uses a photocell and common-mode-suppression circuitry to achievedistortion of 0.0003％。   (View)

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SIGNAL_DROPOUT_DETECTOR

Published:2009/7/10 1:28:00 Author:May

Used to Provide indiration of momentary dropout of d-c,a-c,or pulse input signal.lime between disappear of signal and indication of fault is adiustable. Outpul signal remains until scs is tumed off by momentarily opening reset switch.- Transistor Manual, Seventh Edition, Genercd Electric Co., 1964, p 336.   (View)

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6_volt_flasher_using_an_LM3909_chip

Published:2009/7/19 23:48:00 Author:Jessie

6-volt flasher using an LM3909 chip. Flashing rate is about 1 hertz. Circuitry inside dashed lines is the LM3909 (courtesy National Semiconductor Corporation).   (View)

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RESISTANCE_TRIGG_FRED_ALARM

Published:2009/7/10 1:26:00 Author:May

Silicon controlled switch is triggered when temperature-, light-, or radication-sensifive resistor Rs up to meter drops below vadue of preset potentiometer.Interchanging Rs and potentiometer will trigger alarm on increase in sensing resistor.- Transi stor Manual, Seventh Edition, General Electric Co., 1964, p 425.   (View)

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THREE_DECADE_15_Hz_TO_15_kHz_WIEN_BRIDGE_OSCILLATOR

Published:2009/7/10 1:26:00 Author:May

In this circuit, an LM741 op amp drives a Wien-bridge network using two zener diodes as an ampli-tude limiter. Range selection is done 'oy switch selecting the capacitors (C1 through C6) and tuning is done via a ganged pot. The output is about 8 Vpp max., depending on the setting of S2 and R6. R4 is set for maximum distortion consistent with stable output.   (View)

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SIGNAL_POWERED_ALARM_RECEIVER

Published:2009/7/10 1:25:00 Author:May

On arrival of carrier signal at frequency to which antenna and input are tuned, transistor pulls in relay applying battery power to horn or light. No power is drawn front battery during standby time. For signals below 50 Mc,best pick up is obtained with single-wire an tenna 150 feet long, at right angles to line.of-sight path and as high as possible.-L.R.Crump, Radio Waves Power Transistor Circulls, Electron'Ics, 31:19, p 63-65.   (View)

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LOW_FREQUENCY_LO_OSCILLATOR

Published:2009/7/10 1:25:00 Author:May

Basically a Hartley oscillator using a triple-emitter follower, this oscillator can be used at audio and low radio frequencies. The frequency is given by:At 1 kHz, typically C would be 4.7 μF tantalums, but this is only a guide as to convenient values to use.   (View)

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Safe_high_voltage_flasher_using_an_LM3909

Published:2009/7/19 23:47:00 Author:Jessie

Safe high-voltage flasher using an LM3909. Circuitry inside dashes is the LM3909. If the 43K dropping resistor shown is employed the IC and LED will be about 7 volts above ground (courtesy National Semiconductor Corporation).   (View)

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VERY_LOW_DISTORTION_OSCILLATOR

Published:2009/7/10 1:24:00 Author:May

his oscillator uses a bridge circuit with an optoisolator as a gain-control device. The resultant distor-tion can be held to 9 ppm (.0009%) with proper adjustment.   (View)

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SIX_TRANSISITOR_9_V_BROASCAST_WITH_TUNED_R_F_STAGE

Published:2009/7/19 23:46:00 Author:Jessie

Nominal sensitivity is 30 microvolts per meter, power output 500 mw, and battery drain 12.5 ma.-“Transistor Manual,” Seventh Edition, General Electric Co., 1964, p 296.   (View)

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The function features of TOPSwitch—Ⅱ

Published:2011/7/20 23:27:00 Author:Borg | Keyword: function features, TOPSwitch—Ⅱ

The features of the TOPSwitch—Ⅱproducts:(1) all the functions of PWM control system are combined on the 3-terminal chip, which contains the PWM, power switch MOSFET, auto bias circuit, protection circuit, high voltage starting circuit and circuit compensation circuit, the output terminal and the grid are fully separated by the HF transformer, so the single chip integration of the auto frequency transformer, separator and reversed motivation switch power is completed, which is safe and reliable.   (View)

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PROGRAMMABLE_INVERTER_RECTIFER

Published:2009/7/10 1:23:00 Author:May

The op amp is alternately an inverter or buffer, under control of the switch polarity. As a buffer, the gain is always 1, but as an inverter, the gain is set by the ratio of the input and feedback resistors. By adding a comparator, the function can be synchronously switched as the input polarity changes, which ffectively rectifies the output. The output polarity is determined by the switch logic (normally open or normally closed) and the comparator input polarity.   (View)

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HIGH_STABILITY_3_35_MC_OSCILLATOR

Published:2009/7/19 23:43:00 Author:Jessie

Modification of Lampkin circuit uses pair of cathode followers in cascade, with tube circuits being tapped across part of coil and excited from resonator through high impedance. Bifilar choke minimizes variations in heater-cathode capacitance of driver V2.-E. Robberson, R-F Oscillator has Improved Stability, Electronics, 36:32, p 62-63.   (View)

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WIEN_BRIDGE_BASED_OSCILLATOR_WITH_VERY_LOW_DISTORTION

Published:2009/7/10 1:20:00 Author:May

This complex oscillator circuit uses a photocell and common-mode-suppression circuitry to achieve distortion of 0.0003%. This oscillator circuit replaces the lamp in the traditional Wien bridge with an elec-tronic equivalent.   (View)

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I_F_A_F_REFLEX

Published:2009/7/19 23:41:00 Author:Jessie

Single transistor gives simultaneous amplification at intermediate and audio frequencies in economy radio. Careful design provides high gain and sufficient un distorted output power to drive audio output transistor at full rating without motorboating.-J. Waring, How To Design Reflexed Transistor Receivers, Electronics, 32:19, p 70-72.   (View)

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500_MC_COLPITTS

Published:2009/7/19 23:41:00 Author:Jessie

Frequency varies less than 3 Mc from 25 to 75℃, and less than 1.5 Mc with bias change from 6 to 9 V. Output is 10 mw. T1 is 1.5 length of 3/8 brass rod with output tap 1/4 from bottom.-Texas Instruments Inc., Solid-State Communications, McGraw-Hill, N.Y., 1966, p 301.   (View)

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3_INPUT_AND_GATE_COMPARATOR

Published:2009/7/10 1:18:00 Author:May

This circuit has high output onty when all three inputs are high. The noninverting-input current, when all three inputs are high, must exceed that of the inverting input, as determined by R4. The circuit can be converted to a NAND gate by transposing the two inputs of the op amp.   (View)

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