Circuit Diagram

TWO_STAGE_POSTAMPLIFIER

Published:2009/7/2 7:52:00 Author:May

Connections shown for CA36OOE CMOS transistor-pair array give total open-loop gain of about 160 dB for system. Open-loop slew rate is about 65 V/μs.- Linear Integrated Circuits and MOS/FET's. RCA Solid State Division, Somerville, NJ, 1977, p278-279.   (View)

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COHO

Published:2009/7/24 2:12:00 Author:Jessie

Connected-cathode coherent oscillator has compromise between good short-term frequency stability and good locking ability, as required for measuring pulse-to-pulse phase variation in pulsed r-f systems.-R. H. Holman and R. B. Shields, Measuring Frequency Stability of Pulsed Signals, Electronics, 34:16, p 61-65.   (View)

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QUADRATURE__OSCILLATOR

Published:2009/7/2 7:45:00 Author:May

Addition of diode limiter and positive－feedback resistor to UAF41 universal active filtrer gives precision quadrature oseillator.-Y. J. Wong, Design a Low Cost, Low-Distortion, Precision Sine-Wave Oscillator,EDN Magazzine,Sept20, 1978,p 107－113.   (View)

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Remote_temperature_to_frequency_converter

Published:2009/7/24 2:12:00 Author:Jessie

Fig. 13-8 This circuit converts temperature (from +3°to +300°F) to a corresponding frequency (30 to 3000 Hz). The output is isolated by a 4N28. The circuit can be used to send temperature information across long transmission lines because the 4N28 output voltage can be selected, as required. The scales are adjusted by the total value of RS (12-kΩ fixed and 5-kΩ variable). In practice, when RS is set to about 14.2 kΩ, the output is 10 Hz/°F.   (View)

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MODULATOR_WITH_FEEDBACK

Published:2009/7/24 2:11:00 Author:Jessie

Automatic amplitude stabilization of r-f test signals, within 1 db over 1,300 to 1 frequency range, is achieved by demodulating r-f output with D1 and feeding demodulated voltage back to grid Y of differential amplifier V4. Permits rapid and accurate response measurements over wide range without resetting signal level to input of device under lest.-A. Fong, Feedback Stabilizes Signal Generator, Electronics, 33:29, p 71-73.   (View)

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VARIABLE_DEAD_BAND_RESPONSE

Published:2009/7/2 7:44:00 Author:May

Diode bridge in feedback loop of opamp provides controlled amount of dead-band response. As value of R2 is increased from 0 ohms, voltage developed across R2. serves to raise dead-band level at which bridge opens and circuit amplifies with normal gain of R3/R1. Below dead-band level. bridge is blocked and circuit gain is equal to parallel combination of R2 and R3 divided by R1. Use matched diodes such as CA3O19 for peaks below ±7 V; for higher peaks,.use 1N914s.-W.G. Jung, IC Op-Amp Cookbook, Howard W.Sams. Indianapolis IN.1974. p 207.   (View)

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Single_cell_temperature_compensated_crystal_clock

Published:2009/7/24 2:11:00 Author:Jessie

This 1.5-V oscillator provides a temperature-compensated output without the use of a current-consuming oven. Figure 8-15B shows the compensated-versus-uncompensated oscillator drift. Current consumption is 850 μA or less. The varactor diode tunes the oscillator frequency as the dc bias varies. An ambient-temperature-dependent bias is generated by the remaining circuitry.   (View)

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CONTROLLABLE_12_dB_PER_OCTAVE_ROLLOFF

Published:2009/7/2 7:43:00 Author:May

Frequency at which rolloff starts can be set in range between 15 and 15,000 Hz by extemal voltage or current. If only manual control of frequency is required, short points X and Y and conned them to wiper of 10,000-ohm logarithmic potentiometer that is positioned between -12 V and ground.-T.Orr, Voltage/Current Controlled Filter, Wireless World,Nov.1976, p 63.   (View)

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100_Hz_HIGH_PASS

Published:2009/7/2 7:41:00 Author:May

Metallized polycarbonate capacitor are required for good temperature stability in high-pass active filter using voltage-follower opamp. Cutoff frequency is 100 Hz.- The Linear and Interface Circuits Data Book for Design Engineers, Texas instruments, Dallas, TX, 1973, p 4-39.   (View)

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SPOT_WELDING__TIMER

Published:2009/7/24 2:10:00 Author:Jessie

Five-thyratron sequence timer for resistance-type spot welder meets auto industry requirements for efficiency and reliability.-J. Markus and V. Zeluff, Handbook of Industrial Electronic Control Circuits, McGraw-Hill, New York,1956,p 343.   (View)

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ACTIVE_AF_FOR_SSB_AND_CW

Published:2009/7/2 7:40:00 Author:May

Uses Kinetic Technology FX-60 IC (culled from FS-60, FS-65, and FS-61 production by manufacturer) as 2.5-kHz tunable detected-audio low-pass filter for SSB. Provides inexpensive hybrid active filter using multiloop negative feedback for low-pass transfer functions. External resistors tune filter frequency and give choice of Q. High-impedance buffer Ql provides nominal gain while isolating filter from previous receiver stages.Opamp U2 boosts overall gain.-M. A. Chapman, Audio Filters for Improving SSB and CW Reception,Ham Radio,Nov.1976,p 18-23.   (View)

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60_Hz_ADJUSTABLE_Q_NOTCH

Published:2009/7/2 7:37:00 Author:May

Connection shown for two SN72310 voltage-follower opamps provides attenuation of 60-Hz power-line frequency. Setting of R4 determines a of filter.- The Linear and Intelface Circuits Data Book for Design Engineers, Texas Instruments, Dallas, TX, 1973, p 4-39.   (View)

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NARROW_BANDPASS_FOR_SPEECH

Published:2009/7/2 7:36:00 Author:May

Simple audio filter provides about 20-dB gain at bandwidth of 80 Hz Bandwidth can be narrowed tolimits of unintelligibility by adjusting 10K pot.Input is plugged into phone jack of receiver, and headphones are connected to output. Transistors are SK3004 or equivalent.-Circuits, 73 Magazine, Jan.1974 p 125.   (View)

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Wideband_AGC_amplifier

Published:2009/7/24 2:10:00 Author:Jessie

The SL640 shown in this circuit is a broadband amplifier, providing over 15 dB of linear gain into 50Ω at 400 MHz．Figure 2-9B shows the electrical characteristics. Figures 2-9C, 2-9D,and 2-9E show AGC characteristics, differential output, and single-ended voltage gain, respectively.   (View)

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VARIABLE_Q_FOR_CW

Published:2009/7/2 7:35:00 Author:May

Fixed-frequency active filter gives slowly rising and falling keyed waveform with good slope considering narrowness of bandwidth, which is 75 Hz at 3 dB down. Adjusting Q with 1K pot changes bandwidth.-A.F. Stahler, An Experimental Comparison of CW Audio Filters, 73 Magazine, July 1973, p 65-70.   (View)

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LINEAR_FREQUENCY_SWEEP_GENERATOR

Published:2009/7/24 2:10:00 Author:Jessie

Frequency is swept from 400 to 600 kc electronically by using reverse-biased pn junction diode C as variable capacitor in oscillator V5. Frequency markers are provided. Output is amplified and filtered to give 6 w into 150 ohms with high purity of wave form.-M. M. Brady, Oscillator Design Using Voltage-Variable Capacitors, Electronics, 32:34, p 38-40.   (View)

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TWO_STAGE_CW

Published:2009/7/2 7:33:00 Author:May

Uses diode threshold detector between stages to prevent weak undesired signals from passing through until CW signal of desired frequency is present, so as to provide quiet tuning between signals. Bandwidth of filter is sharp (16 Hz), and keyed waveform is good. Gain is near unity, and frequency and Q are both fixed.-A. F. Stahler, An Experimental Comparison of CW Audio Filters, 73 Magazine, JuIy 1973, p 65-70.   (View)

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TIMER_FOR_RESISTANCE_WELDING_GUN

Published:2009/7/24 2:10:00 Author:Jessie

Provides exact timimg control for squeeze, weld, and hold, us well as fast repeat recycling, by control of thyratrons. Can be operated anywhere from single-shot to over 600 spots per minute. Timer is designed for fail-safe peration.-J. Markus, Handbook of Electronic Control Circuits, McGraw-Hill, New York, 1959, p 322.   (View)

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DIGITAL_CONTROL_T0_100_kHz

Published:2009/7/2 7:30:00 Author:May

Schmitt trig-ger function of CD4093B IC gives oscillator op-eration over four decades of frequency without changing C. Basic frequency value is equal to kl RC, with k equal to 1.3 up to about 5 kHz and decreasing gradually to 1.0 at 100 kHz. Use of CD4016 quad transmission gate permits remote switching in of additional resistors to provide direct digital control of frequency. Arrangement shown gives choice of five unrelated frequen-cies, but binary selection of binary-weighted re-sistors witl give choice of 16 unrelated frequen-cies.-R. Tenny, CMOS Oscillator Features Digital Frequency Control, EDNMagazine, June 5, 1976, p 114 and 116.   (View)

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8O0_kHz_OSCILLATOR

Published:2009/7/2 7:28:00 Author:May

National LM3909 IC operating from single 1.5-V cell is used with standard AM radio ferrite antenna coil having tap 4070 of turns from one end, with standard 365 pF tuning capacitor across coil. Developed for demonstrating versatility of this low-voltage IC.- Linear Applications, Vo1. 2. National Semiconductor, Santa Clara, CA, 1976, AN-154, p8.   (View)

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