Circuit Diagram

TRANSISTORIZED_FLASHER

Published:2009/6/30 2:55:00 Author:May

Circuit Notes This simple circuit will flash a 6 volt lamp at a rate determined by the size ofcapacitor C1.It is most economical on power as it only draws current when the lamp is on. When the lamp is off, both transistors are biased off.   (View)

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NEON_BLINKER

Published:2009/6/30 2:52:00 Author:May

Circuit NotesThe universal output transformer and the transistor form a low-frequency oscillator. The rate of flashing of the neon bulb is determined by potentiometer R1.   (View)

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AUTOMATIC_SAFETY_FLASHER

Published:2009/6/30 2:50:00 Author:May

Circuit Notes This flasher only comes on at night. It furnishes a bright nighttime illumination, and shuts itself off automatically as soon as the sun comes up. The photocell must be mounted on top of the unit in such a way as to detect the greatest amount of available light.   (View)

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8_BIT_BINARY_TO_PROCESS_CURRENT

Published:2009/6/30 2:50:00 Author:May

Usesonly three Precision Monolithics ICs operating from －5V and +23 V supplies to convert 8-bit binary digital input to process current in range of 4-20 mA. Fixed current of 0.5 mA is added to DAC output current varying between 0 and 2 mA, with resulting total current multiplied by factor of 8 to give up to 20 mA through 500-ohm load，—D Soderquist, 3 IC 8 Bit Binary Digital to Process Current Converter with 4-20 mA Output, Precision Monolithics, Santa Clara, CA, 1977, AN-21.   (View)

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Basic_crystal_filter

Published:2009/7/24 12:57:00 Author:Jessie

This circuit replaces the ceramic element of Fig. 7-10 with a 3.57-MHz quartz crystal. Figure 7-12B shows almost 30-dB attenuation only a few kHz on either side of resonance. Linear Technology Corporation, 1991, AN47-48/49.   (View)

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DUAL_LED_CMOS_FLASHER

Published:2009/6/30 2:49:00 Author:May

Circuit NotesInverters ICl-a and ICl-b form a multivi-brator and IC1-c is a buffer. Inverter IC1-d is connected so that its output is opposite that of ICl-c; when pin 6 is high, then pin 8 is low and vice versa. Because pins 6 and 8 are constantly changing state, first one LED and then the other is on since they are connected in reverse.The light seems to jump back and forth be-tween the LED's. The 470-ohm resistor limits LED current. Depending upon the supply vol-tage used, the value of the resistor may have to be changed to obtain maximum light output. To change the switching rate, change the value of the capacitor.   (View)

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THREE_BAND_ACTIVE_TONE_CONTROL

Published:2009/6/30 2:49:00 Author:May

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Piezo_ceramic_based_filter_with_differential_network

Published:2009/7/24 12:56:00 Author:Jessie

This circuit is an improved version of the Fig. 7-10 circuit. With the Fig. 7-11 circuit, a portion of the input is fed to the noninverting input of A1. The RC network at this input looks like the ceramic-resonantor impedance when it is off null, As a result, A1 sees similar signals for out-of-band inputs. The high-frequency roll-off of Fig. 7-11 is smooth and about 20 dB deeper than the Fig. 7-10 filter at 475 kHz. The low-frequency side of resonance has similar characteristics at 375 kHz and below. Linear Technology Corporation, 1991, AN47-48.   (View)

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HI_FI_TONE_CONTROL_CIRCUIT_HIGH_Z_INPUT

Published:2009/6/30 2:48:00 Author:May

The 2N5458 JFET provides the function of a high input impedance and low noise characteristics to buffer an op amp feedback tone control circuit.   (View)

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Basic_piezo_ceramic_based_filter

Published:2009/7/24 12:55:00 Author:Jessie

This circuit is a highly selective bandpass filter that uses a resonant ceramic element and a single amplifier. The ceramic element looks like a high impedance off the resonant frequency (400 kHz, in this case). At resonance, the ceramic element has a low impedance, and A1 responds as an inverter with gain. As shown, the ceramic element has stray or parasitic capacitance that causes a slight rise in output at frequencies above 425 kHz. Typically, the A1 output is down about 20 dB at 300 kHz and 40 dB at 425 kHz. The parasitic capacitance can be minimized with a differential network (Fig. 7-11). Linear Technology Corporation, 1991, AN47-48.   (View)

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RING_COUNTER_FOR_INCANDESCENT_LAMPS

Published:2009/6/30 2:48:00 Author:May

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Elliptic_filter_

Published:2009/7/24 12:53:00 Author:Jessie

With the values shown, this circuit provides a 4th-order 1-kHz elliptic filter (with 4 poles and 4 zeros). The equations are given for other frequencies. Raytheon Linear integrated Circuits, 1989, p. 4-266.   (View)

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Bi_quad_notch_filter

Published:2009/7/24 12:52:00 Author:Jessie

This circuit uses three sections of a quad op amp to form a notch filter. Circuit values are given for a 3-kHz notch with a Q of 5. The equations are given for other frequencies. Raytheon Linear integrated Circuits, 1989, p. 4-266.   (View)

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4_pole_Butterworth_filter

Published:2009/7/24 12:51:00 Author:Jessie

With the values shown, this circuit provides a 1-kHz 4-pole Butterworth filter function, with a direct-coupled input and outputs. Raytheon Linear integrated Circuits, 1989, p. 4-265.   (View)

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MICROPHONE_PREAMPLIFIER_WITH_TONE_CONTROL

Published:2009/6/30 2:47:00 Author:May

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Universal_state_space_filter

Published:2009/7/24 12:50:00 Author:Jessie

This circuit uses all four sections of a quad op-amp to form a universal state-space filter. Raytheon Linear integrated Circuits, 1989, p. 4-265.   (View)

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Dc_coupled_low_pass_active_filter

Published:2009/7/24 12:49:00 Author:Jessie

With the values shown, this circuit provides a 1-kHz low-pass filter function, with a direct-coupled input and output. Raytheon Linear integrated Circuits, 1989, p. 4-174.   (View)

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Low_pass_Butterworth_active_filter

Published:2009/7/24 12:48:00 Author:Jessie

With the values shown, this circuit provides a 400-Hz low-pass filter function. Raytheon Linear integrated Circuits, 1989, p. 4-172.   (View)

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LOW_COST_RING_COUNTER

Published:2009/6/30 2:47:00 Author:May

Circuit Notes This ring counter makes an efficient, low cost circuit featuring automatic resetting via the first stage 3N84. As many stages as desired may be cascaded.   (View)

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_15_V_TO__27_V

Published:2009/6/30 2:47:00 Author:May

Uses 555 timer in self-triggered mode as square-wave generator operating at about 20 kHz, followed by voltage-doubling rectifier. Provides approximate doubling of voltage without use of transformer. Maximum load current is about 80 mA.—M. Strange, IC Timer Makes Transformerless Power Converter, EDN Magazine, Dec. 20, 1973, p 81.   (View)

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