Circuit Diagram

CB_CONVERTER

Published:2009/7/13 4:38:00 Author:May

Uses tunnel-diode oscillator.- Transistor Manual, Seventh Edition, General Electric Co,1964, p358.   (View)

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CLEAN_RESET

Published:2009/7/13 4:37:00 Author:May

Adding latch consisting of two 7400 NAND gates to reset circuit of divide-by-77 counter guarantees good reset. Reset pulse will always be half a clock period wide. -E. E. Hriv-nak, House Cleaning the Logical Way, 73 Mag-azine, Aug. 1974, p 85-90.   (View)

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MOSFET_GATE_DRIVER

Published:2009/7/13 4:37:00 Author:May

This ratiometric 20-kHz voltage-to-frequency converter（VFC） provides superior performance with strain gauges and other ratio-responding transducers，even with noisy, unregulated excitation voltages. Feedback isn’t used to achieve the excellent 4-Hz linearity，so there is very low frequency jitter-period measurements can be used to get several digits of resolution even when operating at a fraction of full scale. An operational synchronizing transistor starts the VFC with zero charge at the beginning of each count Cycle，eliminating the characteristic digit jumping often encountered with VFC designs. Good linearity is attained by making the comparator’s reference voltage vary with the input voltage， which precisely compensates for the finite capacitor reset Lime∶ Period＝t1＋t2 ＝t1＋（Vcc-Vref）／AVin ＝［t1AVin＋Vcc-Vref）／AVinwhere AVin＝ΔV／Δt. If Vref is made to include the amount t1AVin, then the effect of t1 is eliminated∶ Period＝[t1AVin＋VCC-(t1AVin＋Vref)]／AVinThe MPSA-18 is a remarkably high-gain transistor，even at low currents，giving good currentSource linearity down to 0 Hz. In addition，bipolar transistors work well with the low collector voltages encountered In this single-supply，10-V design . Moreover，most single-supply op amps will work in place of the LM10. But the LM10 also has a reference amplifier that could be used to construct a 10-V excitation regulator . The LM311 propagation delay gives a reset pulse width near 400 ns，which gives the transistor time to discharge the capacitor. Also，the 311’s bias current gives a small negative offset that ensures a 0-Hz output for0 V in.   (View)

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OTL Negative Gate Voltage Doubler Rectifier Circuit (For Tube Amp)

Published:2011/7/17 21:29:00 Author:Felicity | Keyword: OTL Negative Gate Voltage, Doubler Rectifier Circuit, (For Tube Amp)

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CONSTANT_BRIGHTNESS_LED_CIRCUIT

Published:2009/7/13 4:36:00 Author:May

This setup ensures that the LED will glow with equal brightness as long as the input voltage remains between 8 and 24 V. R=5/I, where I=desired LED current.   (View)

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BAR_GRAPH_DISPLAY_CIRCUIT

Published:2009/7/13 4:36:00 Author:May

This shows how an LM3914 or LM3915 is connected for 9- to separate LEDs or part of an integral display module.   (View)

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Commonly Used High-voltage Doubler Circuit (For Tube Amp)

Published:2011/7/17 21:16:00 Author:Felicity | Keyword: Commonly Used, High-voltage Doubler, Circuit, (For Tube Amp)

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LARGE_LED_DISPLAY

Published:2009/7/13 4:35:00 Author:May

National MM5736 calculator chip is used with DM8895 segment driver that can be mask-programmed to source several values of current in range from 5 to 17 mA per segment of LED display, permitting use of fairly large display. Display current comes from VCC supply terminal of DM8895 rather than from calculator chip. Combination serves as 6-decade counter driving 6-digit display. -M. Watts, Calculator Chip Makes a Counter, Na-tional Semiconductor, Santa Clara, CA, 1974, AN-112, p 3.   (View)

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50_MC_POWER_AMPLIFIER

Published:2009/7/13 4:35:00 Author:May

Power output is up to 1 w and collector efficiency above 50% for common-base operation.-Texas Instruments Inc., Solid-State Communications, McGraw-Hill, N.Y., 1966, p 317.   (View)

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ADJUSTABLE_BANDWIDTH_AMPLIFIER

Published:2009/7/13 4:35:00 Author:May

Bandwidth can be varied from 190 to 280 kc by varying bias voltage on varicap diodes between 0 and 10 v.Used in frequency-response equalization and other system applications requiring automatically adiustable bandwidth in low-poss circuit.-M. G. Wilson, Low-pass Amplifier with Adiustable Bandwidth, Electronics, 39:11, p 90-91.   (View)

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250_MC_POWER_AMPUFIER

Published:2009/7/13 4:33:00 Author:May

Gives good per formance for both small and large signals.-Texas Instruments Inc., Solid-State Communications, McGraw-Hill, N.Y., 1966, p 320.   (View)

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CALCULATOR_COUNTS_UP_TO_300_Hz

Published:2009/7/13 4:33:00 Author:May

Logic elements used with MM5736 calculator chip provide self-starting counting action In range from 80 to 300 Hz，Increase In counting rate is obtained by feeding digit output 6 back to digit output 4, to bypass some internal logic of calculator. -M. Watts， Calculator Chip Makes a Counter, National Semiconductor, Santa Clara, CA, 1974, AN-112、p4   (View)

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FLASH_TRIGGER

Published:2009/7/13 4:33:00 Author:May

Used in instrument designed to trigger up to five individual flash units at equal increments of time that can rangefrom 11 ms to 11s, as required for such assignments as taking sequence photographs of springboard diver in flight. Transistors Tr1, Tr2, and Tr3 form monostable MVBR that is switched to unstable state by negative pulse applied to base of Tr2 by SCR1 when camera shutter contacts FL1 are closed. Timing circuit Tr4-Tr5-Tr6 provides ramp output at A for feeding voltage-operated switches set to trip at different points of ramp waveform as required for triggering flashes in sequence. Article gives all circuits and setup procedure. Regulated 19.5-V supply is required.-R. Lewis, Multi-Flash Trigger Unit, Wireless World, Nov. 1973, p 529-532.   (View)

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2_BIT_BINARY

Published:2009/7/13 4:32:00 Author:May

Sections of RS7473 dual flip-flop are connected to form simple counter that counts to three in binary with LEDs, By adding more flip-flop stages, count can be extended to higher values. If OFF LED represents 0 and ON LED is 1, combinations 00, 01, 10, and 11 rep-resent 0, 1, 2, and 3, respectively. Input is restricted to low audio frequency so LED changes can be readily observed during demonstrations. -F. M. Mims, Integrated Circuit Projects, Vol, 6, Radio Shack, Fort Worth, TX, 1977, p23-32.   (View)

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CONSTANT_CURRENT_DIODE_AS_COLLECTOR_LOAD

Published:2009/7/13 4:32:00 Author:May

Gain is 45 with 4.7K resistive load, and increases to 750 with CCD as load.Gain-reducing effect of external load paralleling CCD can be eliminated by using emitter.follower to isolate load from collector circuit.-T.K.Hemingway, Applicclfions of the Constant-Current Diode,Electronics, 34:42, p 60-63.   (View)

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TOUCH_SWITCH_2

Published:2009/7/13 4:31:00 Author:May

Small AC signal momentarily introduced by finger contact on touch plate causes voltage at pin 8 of CA3098 dual-input precision level detector to be greater than high reference voltage. This toggles memory flip flop in IC, making voltage high at pin 5. Vottage at pin 7 then increases exponentially to V+ in about 10 s.This 10-sdelay is maximumthat button can betouched; longertouch makes system oscillate between ON and OFF states until finger is removed. Shorter touch energizes load, placing pin 7 at V+. Next touch of plate turns circuit off.-G. J. Granieri, Precision Level Detector IC Simplifies Control Circuit Design, EDN Magazine, Oct. 5, 1975, p 69-72.   (View)

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TWO_CHIP_COUNTER

Published:2009/7/13 4:31:00 Author:May

Combination of Na-tional MM5736 calculator chip and DM75492 digit driver for 6-digit LED display is suitable for applications where typical maximum counting rate can be about 100 Hz. Counter is reset manually by closing S1 to clear calculator and closing S2 to enter a 1. Operator now controls start of new count by pressing S,, without need for gating count input. -M. Watts, Calculator Chip Makes a Counter, National Semiconductor, Santa Clara, CA, 1974, AN-112, p 2.   (View)

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BAR_GRAPH_DISPLAY_DRIVER_SCALE_SETTING

Published:2009/7/13 4:31:00 Author:May

The figure shows ways of varying the reference with the internal generator of the bar-graph driver chip. (a) and (b) show two obtain full scales of 1 V and 0.5 V, respectively. In (c), the reference adjust and internal reference are used to produce 2 V.   (View)

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SELF_DRIVING_COUNTER

Published:2009/7/13 4:29:00 Author:May

UJT relaxation oscillator Q1 supplies series of pulses to input pin 14 of RS7490 decade counter at frequency determined by setting of R2 and value used for C1 Counter feeds corresponding BCD outputs to BCD input pins of RS7447 decoder for conver-sion into 7-segment decimal format for driving Radio Shack 276-052 LED display. Ideal for class-room demonstrations a nd Science Fair exhibits. 6-V battery with 1N914 diode in series can be used in place of 5-V supply. -F. M. Mims, In-tegrated Circuit Projects, Vol. 2, Radio Shack, Fort Worth, TX, 1977, 2nd Ed., p 41-56.   (View)

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CONTACTLESS_KEYBOARD

Published:2009/7/13 4:29:00 Author:May

Touching one of 16 metal pads at inputs of 74150 multiplexor produces corresponding 4-bit BCD output from 74194 shift register. During scanning of multiplexer inputs by counter, output is produced only when finger of operator is on corresponding fingertip-size touch pad. Requires 10-kHz pulse from external source to strobe multiplexer and serve as clock for counter. Duration of clock pulse must be more than 20 ns so untouched pads charge up to threshold voltage but not long enough to let touched pad charge.-D. Cockerell, TTL IC Serves as Touch Keyboard, Electronics, Feb. 20, 1975, p 108-109.   (View)

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