Morse_code_set

Published:2009/7/19 23:09:00 Author:Jessie

In this circuit, the LM3909 (connected as an oscillator) drives speakers at both sending and receiving ends, simultaneously. National semiconductor, Linear Applications Handbook, 1991 p 400   (View)

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±15V_SYMMETRICAL_AT_1A

Published:2009/7/19 23:06:00 Author:Jessie

Connectionshown gives same lineand load regulation characteristics as for individual regulators. D1 ensures start-up of LM340K.15 under worst-case conditions of common load and 1.A load current over full temperature range.- Linear Applications, Vol. 2, National Semiconductor, Santa Clara, CA, 1976, AN-103, p 8.   (View)

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Series_chopper_for_large_input_voltages_using_an_N_channel_JFET

Published:2009/7/19 23:04:00 Author:Jessie

Series chopper for large input voltages using an N-channel JFET (courtesy Motorola Semiconductor Products Inc.).   (View)

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Series_shunt_chopper_for_high_frequency_applications_using_complementary_enhancement_mode_MOSFETs

Published:2009/7/19 23:03:00 Author:Jessie

Series-shunt chopper for high-frequency applications using complementary enhancement mode MOSFETs (courtesy Motorola Semiconductor Products Inc.).   (View)

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MOSFET_analog_switching_circuit_chopper_for_large_input_voltages

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

MOSFET analog switching circuit (chopper) for large input voltages (courtesy Motorola Semiconductor Products Inc.).   (View)

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FM_stereo_processor

Published:2009/7/19 22:57:00 Author:Jessie

FM stereo processor. Supply voltage is typically +12 volts. The ECG718 is a 14-pin DIP with the functions of a 19 kHz amplifier, frequency doubler, stereo indicator lamp driver, audio mute, stereo/mono switch, and stereo demodulator (courtesy GTE Sylvania Incorporated).   (View)

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FOUR_TRANSISTOR_REFLEX

Published:2009/7/19 22:57:00 Author:Jessie

Nominal sensitivity is 200 microvolts per meter at 5 mw reference power output. Maximum power output is 75 mw, and total battery drain is 17 ma.- Transistor Manual, Seventh edition, General Electric Co., 1964, p 291.   (View)

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TRACKED_CURRENT_LIMITING

Published:2009/7/19 22:57:00 Author:Jessie

Simultaneous limiting scheme for both sections of National dual tracking regulator depends on output cur-rent of positive regulator. Voltage drop produced across R1 by positive regulator brings Q1 into conduction, with positive load current I1 increasing until voltage drop across R2 equals negative current-limit sense voltage. Negative regulator will then current-limit, and positive side will closely follow negative output down to level of about 700 mV.-T. Smathers and N. Sevastopoulos, LM125/LM126/LM127 Precision Dual Tracking Regulators, National Semiconductor, Santa Clara, CA, 1974, AN-82, p 13.   (View)

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8748_to_8251_interface

Published:2009/7/19 22:56:00 Author:Jessie

8748 to 8251 interface. The 8748 is an MCS-48 processor and the 8251 is a USART (courtesy Intel Corporation).   (View)

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SLAVED_DUAL_TRACKING_REGULATOR

Published:2009/7/19 22:55:00 Author:Jessie

Uses Fairchild μA78MG adjustable four-terminal regulator with opamp and power transistor for delivering output currents up to 0.5 A per side, with output voltages adjustable from ±5V to ±20V for component values shown.. Positive side functions independently of negative side, but negative output is slave of positive output.To slave positive side, use μA79MG and 2N6121 NPN transistor as at (b). Opamp functions as inverting amplifier driving power transistor serving as series-pass element for opposite side of regulator, with R1 adjusting both output volt-ages simultaneously.-A. Adamian, Dual Adjustable Tracking Regulator Delivers 0.5A/Side, EDN Magazine, Jan, 5, 1977, p 42.   (View)

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ANTENNAFIER

Published:2009/7/19 22:55:00 Author:Jessie

Varactor-tuned transistor amp lifer bulb into tip of conical spiral antenna is tuned from 120 to 240 Mc by varying varactor voltage from 0 to 40 v d-c.-J. F. Rippin, Making the Antenna an Active Part-net, Electronics, 38:16, p 93-96.   (View)

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Number_cruncher_interface_with_the_SC_MP_microprocessor

Published:2009/7/19 22:51:00 Author:Jessie

Number cruncher interface with the SC/MP microprocessor. The number cruncher unit (NCU) shown is an MM57109 (courtesy National Semiconductor Corporation).   (View)

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TONE_SIGNAL_REJECTOR

Published:2009/7/19 22:49:00 Author:Jessie

Used to separate desired backscatter pulses from unwanted tone signals of interfering stations on same frequency. Negative-going portion of tone signal is rectified and used us slicer level for passing desired pulse, which rides on top of interfering tone.-K. Perry, Reducing Interference in Ionospheric Sounding, 33:22, Electronics, p 118-120.   (View)

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±24V_REGULATED_AND_±35V_UNREGULATED

Published:2009/7/19 22:48:00 Author:Jessie

Developed for use with high-performance stereo preamp. Each IC regulator re quires about 7 cm2 of heatsink area. Red LED is TIL209 or equivalent.－D Self, Advanced Preamplifier Design Wireless World,Nov,1976 p41－46.   (View)

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AUDIO_FOR_A_M_F_M_PORTABLE

Published:2009/7/19 22:48:00 Author:Jessie

Overall power gain is 70 db, with audio output of 1 w at less than 10% distortion.-R. A. Santilli and H. Thanos, Portable Radio Uses Drift-Field Transistors, Electronics, 33:28, p 48-50.   (View)

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Teletypewriter_RS_232C_terminal_to_MC6850_ACIA_interface

Published:2009/7/19 22:47:00 Author:Jessie

Teletypewriter/RS-232C terminal to MC6850 ACIA interface (courtesy Motorola Semiconductor Products Inc.).   (View)

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THREE_TRANSISTOR_A_M_F_M_I_F_STRIP

Published:2009/7/19 22:46:00 Author:Jessie

Used in a-m/f-m portable radio. Only two stages operate on a-m.-R. A. Santilli and H. Thanos, Portable Radio Uses Drift-Field Transistors, Electronics, 33:28, p 48-50.   (View)

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5V_AT_5A

Published:2009/7/19 22:46:00 Author:Jessie

Current-sharing design provides short-circuit protection, safe-operating-area protection, and thermal shutdown. Typical load regulation is 1.4%.-W. R. Calbo, A High-Cur-rent, Low-Voltage Regulator for TTL Circuits, QST, Sept. 1975, p 44   (View)

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45_34V_VARIABLE_AT_1A

Published:2009/7/19 22:45:00 Author:Jessie

National LM195 power transistor is used with LM105 regulator to give fully adjustable range of output voltages with overload protection and only 2-V input-to-output voltage differential. Load regulation is better than 2 mV.-R. Dobkin, Fast IC Power Transistor with Thermal Protection, National Semiconductor, Santa Clara, CA, 1974, AN-110, p4.   (View)

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28V_AT_7A

Published:2009/7/19 22:44:00 Author:Jessie

Uses Motorola MPC1000 positive voltage regulator to provide regulated voltage for aircraft radio equipment being used at ground station. Current-limiting resistor RSC is in range of 0.66 to 0.066 ohm. Use copper wire about 50% longer than calculated length and shorten step by step until required pass current is obtained; thus, start with 25 ft of No. 16, 15 ft of No. 18, 10ft of No. 20, or 6ft of No. 22. Input voltage is obtained from 30-V transformer and bridge rectifier.-G. L. Tater, The MPC1000-Super Regulator, Ham Radio, Sept. 1976, p 52-54.   (View)

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