Circuit Diagram

105_MHz_to_107_MHz_mixer_using_a_TIS152_dual_gate_MOSFET

Published:2009/7/20 22:28:00 Author:Jessie

105 MHz to 10.7 MHz mixer using a TIS152 dual-gate MOSFET (courtesy Texas Instruments Incorporated).   (View)

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CMOS_to_4_digit_incandescent_display_interface

Published:2009/7/20 22:27:00 Author:Jessie

CMOS to 4-digit incandescent display interface(Courtesy Motorola Semiconductor Products Inc.).   (View)

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TACHOMETERLESS_SERVO

Published:2009/7/20 22:26:00 Author:Jessie

Developed to provide speed control for motor enclosed in such a way that tachometer cannot be used for feedback Position pot R1 and differentiator B substitute for tachometer in controlling rate of scanning-microscope eyepiece used for measuring CRT line width. Buffer A1 feeds X input of XY plotter through opamp A2, and also feeds differentiator B and limit-detector voltage comparator C1-C2. S1 switches A3 between inverting and noninverting operation each time scanning direction changes, to keep feedback negative.-H. F. Stearns, Differentiator and Position Pot Sub for Tachometer, EDN Magazine, Aug. 5, 1977, p 50-52.   (View)

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4_digit_CMOS_gas_discharge_display_

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

4-digit CMOS gas discharge display (courtesy Motorola Semiconductor Products Inc.).   (View)

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B_Y_DEMODULATOR

Published:2009/7/20 22:21:00 Author:Jessie

Used in transistorized color tv. R-Y demodulators are identical except for having different demodulation phase angle. –D. Bray, Solid State Makes Debue in Big-Screen Color Tv Electronics, 39:8, p 99-105.   (View)

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10_channel_scanning_logic_for_PF_scanner_monitor_receiver

Published:2009/7/20 22:44:00 Author:Jessie

10-channel scanning logic for PF scanner/monitor receiver (courtesy Motorola Semiconductor Products Inc.).   (View)

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DARLINGTON_PHASE_SHIFTER

Published:2009/7/20 22:43:00 Author:Jessie

Basic 90°push-pull RC phase shifter using discrete transistors is connected as phase-splitting amplifier Used at output of follow-up pot in servo amplifier driving 115-V 60-Hz servomotor Supply is 28 V Motorola MPSA13 Darlington IC can be used if 39K resistor is omitted.－A, Pshaenich, Servo Motor Drive Amplifiers, Motorola,Phoenix,AZ,1972,AN-590.   (View)

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Staircase_generator_2

Published:2009/7/20 22:43:00 Author:Jessie

Staircase generator. The number of steps is determined as follows: n=(C1 VBR)/(Iptp), where n is the number of steps, VBR is the breakdown voltage at the PNPN diode, IP is the pinchoff voltage of the 1N5283 and tp is the pulse width (courtesy Motorola Semiconductor Products Inc.).   (View)

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TTL_SERVO_CONTROL

Published:2009/7/20 22:42:00 Author:Jessie

Used in nine-channel remote control system having nine identical servos fed by decoder at receiving end of data link. Variable-width pulse command from decoder is fed into TTL IC pulse-width comparator that feeds bridge-type motor drive. Command pulse controls both direction and duration of motor rotation. Article describes operation in detail and gives associated coder and decoder circuits.-M. F. Bessant, Multi-Channel Proportional Remote Control, Wireless World, Oct.1973, p 479-482.   (View)

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27_MHz_AGC_able_self_oscillating_mixer_for_CB_operation_using_a_TIS148_dual_gate_MOSFET

Published:2009/7/20 22:42:00 Author:Jessie

27 MHz AGC-able self-oscillating mixer for CB operation using a TIS148 dual gate MOSFET (courtesy Texas Instruments Incorporated).   (View)

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SERVO_DRIVE

Published:2009/7/20 22:40:00 Author:Jessie

Combination of Fairchild μA795 multiplier and μA741 opamp generates AC error signal for driving two-phase servo-motor. Phase-shifted signal from R1-C1 is applied to input pin 4 of multiplier, DC signal input is applied to pin 9, and servo position signal goes to pin 12. Multiplier takes difference between signals on 9 and 12, multiplies this by signal on pin 4, and feeds resulting sine wave from pin 14 to opamp for amplification and transfer to servo driver. When servomotor action makes voltages on 9 and 12 equal, system is nulled.-Fairchild Linear IC Contest Winners, EEE Magazine, Jan. 1971, p 48-49.   (View)

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27_MHz_to_107_MHz_mixerfor_CB_operation_using_a_TIS148_dual_gate_MOSFET

Published:2009/7/20 22:40:00 Author:Jessie

27 MHz to 10.7 MHz mixerfor CB operation using a TIS148 dual-gate MOSFET(courtesy Texas Instruments Incorporated).   (View)

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Precision_ramp_generators_using_a_Datel_ADC_MC8B_16_pin_DIP

Published:2009/7/20 22:39:00 Author:Jessie

Precision ramp generators using a Datel ADC-MC8B 16-pin DIP. Pin functions of the ADC-MC8B are as follows: pin 1, ground; pin 2, logic select; pin 3, reset; Pin 4, strobe; pin5, bit8(LSB); pin6, bit7; pin 7, bit6; pin8, +Vcc; pin 9, bit 5; pin 10, bit4; pin 11, bit3; pin 12, bit2; pin 13, bit 1 (MSB); pin 14, analog output; pin 15, VREF input; pin 16, VREF output (courtesy Datel Systems, Inc.).   (View)

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DUAL_OPAMP_PREAMP

Published:2009/7/20 22:38:00 Author:Jessie

First section of Motorola MC1437 dual opamp is connected as operational differentiator driving direct-coupled noninverting opamp. Single-ended output is converted to push-pull by following phase-split-ting amplifier for driving power amplifier of 115-V 60-Hz servomotor.-A. Pshaenich, Servo Motor Drive Amplifiers, Motorola, Phoenix, AZ, 1972, AN-590.   (View)

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Single_pulse_generator_using_an_SUS

Published:2009/7/20 22:37:00 Author:Jessie

Single pulse generator using an SUS. This circuit is useful in testing digital equipment. The output is a clean debounced pulse of 3 ms duration (courtesy Motorola Semiconductor Products Inc.).   (View)

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5_digit_incandescent_display

Published:2009/7/20 22:36:00 Author:Jessie

5-digit incandescent display (courtesy Motorola Semiconductor Products Inc.).   (View)

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900_MHz_BF_amplifier_using_a_3N225_dual_gate_MOSFET

Published:2009/7/20 22:35:00 Author:Jessie

900 MHz BF amplifier using a 3N225 dual-gate MOSFET. Coils L1 and L2 consist of the leads of the 1 pF and 3 pF capacitors (courtesy Texas Instruments Incorporated).   (View)

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1_MHz_oscillator_using_the_MC1553_video_amplifier

Published:2009/7/20 23:06:00 Author:Jessie

1 MHz oscillator using the MC1553 video amplifier (courtesy Motorola Semiconductor Products Inc.).   (View)

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27_MHz_transmitter_for_CB_operation

Published:2009/7/20 23:05:00 Author:Jessie

27 MHz transmitter for CB operation. Power output is 3.5 watts minimum. Typical efficiency is 70%. Modulation can be±100%. Second harmonic suppression istypically 38 dB down, while third harmonicsuppression is 55 dB down. All coilsare on 1/4-inch forms with AWG #22 wire. Slugs are 1/4 by 3/8-inch J-types. Secondary windings are overwound on the bottom of the primary. L1 primary is 12 turns close wound, while the secondary is 2 turns. L2 primary is 18 turns close wound, while its secondary is 2 turns. L3 is 7 turns dose wound. L4 is 5 turns close wound (courtesy Motorola Semiconductor Products Inc.).   (View)

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12_VDC_DRIVE

Published:2009/7/20 23:05:00 Author:Jessie

Circuit uses 791 power opamp in inverting configuration with gain of 10 for driving size 8 12-VDC servomotor in either direction. Article tells how to calculate heatsink requirements for opamp.-R. J. Apfel, Power Op Amps-Their Innovative Circuits and Pack-aging Provide Designers with More Options, EDN Magazine, Sept. 5, 1977, p 141-144,   (View)

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