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_10V_AT_1A

Published:2009-7-19 21:41:00 Author:Jessie

_10V_AT_1A
National LM195 power transistor, used with LM105 regulator, provides full overload protection. Load regulation is better than 2 mV. Circuit requires only 2-V differential between input and output voltages.-R. Dob-kin, Fast IC Power Transistor with Thermal Protection, National Semiconductor, Santa Clara, CA, 1974, AN-110, p 5.   (View)

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Electronic_music_synthesizer

Published:2009-7-19 21:41:00 Author:Jessie

Electronic_music_synthesizer
In this circuit, the XR-2207 oscillator produces a sequence of tones by oscillating at a frequency set by C1 and resistors R1 through R6 (which sot the frequency or pitch of the output tone sequence). The XR-2240 counter/timer generates pseudo-random pulse patterns by selectively counting down the time-base frequency. The outputs of XR-2240 (pins 1 through 8) activate the timing resistors R1 through R6 of XR-2207, which convert the binary pulse patterns to tones. C3 and R0 set the beat or tempo of the music. The output tone sequence continues for about 1 to 2 minutes (depending on the beat ) and then repeats. The XR-2240 resets to zero when power is applied, so the tone sequence (or music) always starts from the same point when the synthesizer is turned on.   (View)

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FREQUENCY_SHIFT_KEYED_OSCILLATOR

Published:2009-7-19 21:40:00 Author:Jessie

FREQUENCY_SHIFT_KEYED_OSCILLATOR
Q1 is Colpitts oscillator at 5 kc and Q2-Q3 is push-pull complementary-emitter amplifier with unity voltage gain. Either switch shorts amplifier, thereby increasing tuning capacitance enough to shift frequency 1 kc.-N. C. Hekimian, Getting Rid of Transients in Frequency-Shift Keying, Electronics, 35:45, p 58-59.   (View)

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Voltage_follower_using_an_ECG915_operational_amplifier

Published:2009-7-19 21:39:00 Author:Jessie

Voltage_follower_using_an_ECG915_operational_amplifier
Voltage follower using an ECG915 operational amplifier. Output is taken on pin 6 (courtesy GTE Sylvania Incorporated).   (View)

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DUTY_CYCLE_DETECTOR

Published:2009-7-10 4:15:00 Author:May

DUTY_CYCLE_DETECTOR
This circuit looks at the time an incoming pulse is high. If the incoming pulse is shorter than the adjusted (VAR1) pulse, the output of U1B is high. Values are shown for a 1-to 2-μs pulse.   (View)

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POWER_MOSFET_SWITCH

Published:2009-7-10 4:15:00 Author:May

POWER_MOSFET_SWITCH
POWER_MOSFET_SWITCH

This solid-state switch senses and interrupts an overcurrent condition within 2μs. I1 allows the circuit to float. IC1 runs at 150 kHz and full-wave doubler D1/D2 provides 15 V to the gate of Q1. An overcurrent sensed across R1 triggers Q3, removes gate bias from Q1, and opens the circuit formed by the full-wave bridge and Q1. C1 and R3 allow the circuit to handle surges.   (View)

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AIR_PRESSURE_CHANGE_DETECTOR

Published:2009-7-10 4:15:00 Author:May

AIR_PRESSURE_CHANGE_DETECTOR
A piezoelectric detector (BZ1) is used in this circuit to detect a change in air pressure. BZ1 produces a voltage that is amplified by U1A and UlB. Frequency response is limited to low frequencies. The signal is rectified by D1 and D2 and drives Q1, which activates BZ2, a piezoelectric buzzer.   (View)

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SENSITIVE_CONTINUITY_CHECKER

Published:2009-7-10 4:14:00 Author:May

SENSITIVE_CONTINUITY_CHECKER
This continuity checker (built around an LM339 quad comparator with open-collector outputs) elimi-nates false readings because of coils or low-resistance devices in a circuit. U1 is a comparator that acts as a sensing amplifier for the bridge circuit (R1 and D1, R3 and the unknown resistance, RX that is connected across the test leads. When RX is less than this predetermined value (by the setting of R1), the LED lights and BZ1 sounds.   (View)

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SQUARE_WAVE_ASTABLE_CIRCUIT

Published:2009-7-10 4:12:00 Author:May

SQUARE_WAVE_ASTABLE_CIRCUIT
This 555 circuit produces a square wave. The frequency depends on the values of RT and CT, as per the design equations.   (View)

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Precision_electronic_thermometer

Published:2009-7-19 21:38:00 Author:Jessie

Precision_electronic_thermometer
Precision_electronic_thermometer
Precision_electronic_thermometer
Precision_electronic_thermometer
Precision_electronic_thermometer

This circuit shows how a voltage reference can be combined with an op amp to create an electronic thermometer (with±5% accuracy). To calibrate, measure the voltage at pin 3 of REF-02, and the ambient room temperature (TA in℃). Then find X as follows: selected from table in Fig. 12-8. Then, turn off the power, short pin 6 (VO) of REF-02 to ground, apply exactly 100.00 mV to the op-amp output (pin 6 of OP-07), and adjust RB2 so that VB= X. Now, remove the short and the 100-mV source, reapply circuit power, and adjust RP so that the op-amp output voltage equals (TA) (,S). The system is now calibrated. For remote sensor applications, a 1.5-kΩ resistor (RS) must be connected in series with pin 6 of REF-02. This isolates REF-02 from cable capacitances. Use low temperature coefficient metal-film resistors for RA, RB, and RC Raytheon Linear integrated Circuits, 1989 p. 8-16   (View)

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Inverting_unity_gain_high_slew_rate_circuit_using_an_ECG915_operational_amplifier_

Published:2009-7-19 21:38:00 Author:Jessie

Inverting_unity_gain_high_slew_rate_circuit_using_an_ECG915_operational_amplifier_
Inverting unity-gain high-slew-rate circuit using an ECG915 operational amplifier (courtesy GTE Sylvania Incorporated).   (View)

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FOLDBACK_CURRENT_LIMITING

Published:2009-7-19 21:38:00 Author:Jessie

FOLDBACK_CURRENT_LIMITING
Reduces short-circuit output current of National LM125 dual tracking regulator sections to fraction of full-load output current, avoiding need for larger heatsink. Programmable current source is used to give constant voltage drop across R5 for negative regulator. Simple resistor divider serves same purpose for positive regulator. Design examples are given.-T. Smathers and N. Sevastopoulos, LM125/LM126/LM127 Precision Dual Tracking Regulators, National Semi-conductor, Santa Clara, CA, 1974, AN-82, p7.   (View)

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PEAK_DETECTOR_1

Published:2009-7-10 4:12:00 Author:May

PEAK_DETECTOR_1
An analog signal requires about 100 ns to prop-OUTPUT agate through the HA-5320. For time-varying signals, this assures a voltage difference between input and output. Also, the voltage changes polarity when the signal slope changes polarity (passes a peak). This behavior makes the circuit a possible sample/hold peak detector, by adding a comparator to detect the polarity changes. The exclusive NOR gate allows a reset function which forces the HA-5320 to the sample mode. The connections shown detect positive peaks; the comparator inputs can be reversed to detect negative peaks. Also, the offset must be introduced to provide enough step in voltage to trip the comparator after passing a peak. This circuit works well from below 100 Hz up to the frequency at which slew-rate limiting occurs. It captures the amplitude of voltage pulses, provided that the pulse duration is sufftcient to slew to the top of the pulse.   (View)

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JFET_WITH_AC_COUPLING

Published:2009-7-10 4:11:00 Author:May

JFET_WITH_AC_COUPLING
Connection shown gives very high voltage gain. Use of C1 as Miller integrator or capacitance multiplier allows simple circuit to handle very long time constant.- FET Databook, National Semiconductor, Santa Clara, CA, 1977, p 6-26-6-36.   (View)

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HIGH_GAIN_CURRENT_SENSOR

Published:2009-7-10 4:11:00 Author:May

HIGH_GAIN_CURRENT_SENSOR
A high-gain amplifter using a UA741 is used to sense relative voltage drop in a conductor, and therefore current in the conductor. R2 can be increased to 10 MΩ for increased sensitivity. LEDt and LED2 provide polarity indication. This circuit can be used to detect current flowing in a PC board trace, and also for locating shorts and opens.   (View)

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12_22_Mc_VOLTAGE_CONTROLLED_OSCILLA_TOR

Published:2009-7-19 21:38:00 Author:Jessie

12_22_Mc_VOLTAGE_CONTROLLED_OSCILLA_TOR
Voltage-variable capacitor tunes tunnel-diode oscillator electronically.- Transistor Manual, Seventh Edition, General Electric Co., 1964, p 350.   (View)

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Noninverting_op_amp_using_an_AD510_8_pin_TO99_

Published:2009-7-19 21:38:00 Author:Jessie

Noninverting_op_amp_using_an_AD510_8_pin_TO99_
Noninverting op amp using an AD510 8-pin TO99 (courtesy Analog Devices, Inc.).   (View)

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MECHANICAL_COUNTER_DRIVE

Published:2009-7-19 21:37:00 Author:Jessie

MECHANICAL_COUNTER_DRIVE
Takes output from scale-of-64 circuit and converts to 40-millisec square-wave pulse by means of complementary mvbr, to drive coil of mechanical register, once for every 64 pulses from G –M tube,-F, E. Armstrong, Battery Powered Portable scaler Electronic, 33:19 74-75.   (View)

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Inverting_amplifier_using_half_of_an_ECG947_dual_operational_amplifier

Published:2009-7-19 21:37:00 Author:Jessie

Inverting_amplifier_using_half_of_an_ECG947_dual_operational_amplifier
Inverting amplifier using half of an ECG947 dual operational amplifier. The ECG947 is short-circuit protected and requires no external components for frequency compensation (courtesy GTE Sylvania Incorporated).   (View)

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3_260_MC_TUNNEL_DIODE_OSCILLATOR

Published:2009-7-19 21:37:00 Author:Jessie

3_260_MC_TUNNEL_DIODE_OSCILLATOR
Uses plug-in coils to generate sine-wave output over wide frequency range.- Transistor Manual, Seventh Edition, General Electric Co., 1964, p 352.   (View)

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