Published:2009/7/14 4:44:00 Author:May
Operates over control-voltage range of +10 mV to +10 V to provide either square or triangle outputs from 5 Hz to 5 kHz, Can be used for instrumentation or electronic music applications.- W. G. Jung, IC Timer Cookbook, Howard W. Sams, Indianapolis, IN, 1977, p 174-179.
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Published:2009/7/14 4:33:00 Author:May
Instrumentation recorder for plasma studies uses discharge of capacitor at beginning of each plasma pinch discharge to trigger lash tube, light from which is chopped by glass disk driven at constant speed by synchronous motor.-J. J. Pearson, Instrumentation for Plasma Propulsion, Electronics, 33:24, p 66-69. (View)
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Published:2009/7/14 4:40:00 Author:May
Two sections of LM3900 quad linear opamp provide linear response for inputs of 2-12 VDC, Circuit can be adjusted with 1-megohm pot so 4-V input produces 400-Hz square wave at output, 5 V gives 500 Hz, etc. First opamp is connected as integrator and second as Schmitt trigger. When Schmitt output is high, transistor is turned on and diverts current away from noninverting input so integrator output ramps down toward ground.-C. Sondgeroth, More PLL Magic, 73 Magazine, Aug. 1976, p 56-59. (View)
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Published:2009/7/15 3:36:00 Author:Jessie
Afc input signal acts through series resistor to vary collector voltage of 40.Mc oscillator. Sensitivity is 2.5 Mc per V. Bias network adjustment is critical.-T. P. Prouty, Using Varactors to Extend Frequency-Control Range, Electronics, 36:45, p 48-49. (View)
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Published:2009/7/15 3:35:00 Author:Jessie
Oscillator transistor also acts as a d-c amplifier between afc input and varactor diode to give electronic tuning over range of 11 Mc with sensitivity of 5.8 Mc per v.-T. P. Prouty, Using Varactors to Extend Frequency-Control Range, Electronics, 36:45, p 48-49. (View)
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Published:2009/7/15 3:04:00 Author:Jessie
Handles twice the power of single-ended circuit using same varactor diode, while doubling 125-Mc input. Varactors VC are PSI type PC116.Efficiency is 70%. Transformer winding data is given in article.-R. D. Gromer, VHF Balanced Parametric Doubler, EEE, 11:8, p 30-31. (View)
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Published:2009/7/15 3:03:00 Author:Jessie
Supplies 160 Mc at up to 0.5 w. Output impedance is 50 ohms.-R. C. Wonson, Designing VHF Valactor Multipliers, FEE, 11;12, p 48-52. (View)
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Published:2009/7/15 3:03:00 Author:Jessie
Frequency of sinusoidal signal is doubled with only one transistor, one coupling capacitor, and four resistors, by utilizing nonlinear characteristic of transistor for half-wave rectification. Purity of output waveform is adjusted with feedback control R1.-R. J. Miller, Jr., Audio Frequency Doubling Without Bulky filters, EEE, 12:12, p 57. (View)
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Published:2009/7/15 3:02:00 Author:Jessie
Used to extend usefulness of conventional time marker generator.-R. M. Zilberstein, Frequency Doublet and Amplifier, EEE, 12:12, p 57. (View)
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Published:2009/7/15 3:01:00 Author:Jessie
Combination series-parallel trap in collector circuit provides 50 db rejection of fundamental in output that is tuned to second harmonic.-Texas Instruments Inc., Transistor Circuit Design, McGraw-Hill, N.Y., 1963, p 328. (View)
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Published:2009/7/15 2:59:00 Author:Jessie
First stage is grounded-grid amplifier, with plate tuned by 1-turn coil and variable capacitor. Common-grid tripler and doublet are tuned with coaxial resonators. –A. E. Anderson and H. D. Hern, F-M Exciter For Sight or Scatter Systems,Electronics,31:11, p 148-151. (View)
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Published:2009/7/15 2:57:00 Author:Jessie
Input signal from frequency-multiplying oscillator is stepped up to 80 v peak-to-peak, with 1-microsec rise time, for accurate triggering of decade counter.-W. O. Brooks, Stepping up Frequency with Counter Circuits, Electronics, 32:29, p 60-62. (View)
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Published:2009/7/14 4:32:00 Author:May
Multivibrators generate single pulse to drive flash tube at unspecified time of from 2 to 10 seconds after switch is closed.-P. Scott, Microflash and Pulse Stimulator Tests Human Response, Electronics, 34:27, p 48-51. (View)
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Published:2009/7/15 2:57:00 Author:Jessie
Uses distributed R.C networks consisting of resistive and conductive layers on dielectric substrate, with d-c applied between electrodes at 65 v for doubling frequency of ceramic-dielectric 400-cps oscillator.-M. M. Perugini, Race to Reduce Capacitor Size, EEE, 10:7, p 61-64. (View)
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Published:2009/7/15 2:56:00 Author:Jessie
Charge-storage 1N4386 varactor triples frequency with power efficiency of 70% for input of 50 watts.-G. Schaffner, Charge Storage Vcractors Boost Harmonic Power, Electronics, 37:20, p 42-47. (View)
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Published:2009/7/15 3:34:00 Author:Jessie
Error signal, usually derived from external discriminator, is applied in series with base bias network to give sensitivity of about 1.5 Mc per v and nearly straight voltage-frequency characteristic.-T. P. Prouty, Using Varactors to Extend Frequency-Control Range, Electronics,36:45, p 48-49. (View)
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Published:2009/7/14 4:20:00 Author:May
Gives pair of output pulses, with opposite polarity, for controlling timing and spacing of flashes.-P. Scott, Microflash and Pulse Stimulator Tests Human Optical Response, Electronics, 34:27, p 48-51. (View)
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Published:2009/7/15 4:59:00 Author:Jessie
Separate noninteracting frequency and duty-factor controls permit construction of simple telemetry oscillators having inherently linear transfer function. Absolute synchronization of independent and dependent variables is obtainable with relatively simple pulse-generating circuits. Synchronization cannot be lost. Average value of threshold voltage is maintained constant. Adjustment of hysteresis gap width moves threshold voltage limits symmetrically about average value. Resistance portion of RC delay is switched from positive to negative voltage symmetrically also. Article covers circuit operation in detail.-W. H. Swain, True Digital Synchronizer Employs Hysteresis-and-Delay Element, EDN Magazine, Jan. 1, 1971, p 33-35. (View)
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Published:2009/7/15 4:55:00 Author:Jessie
High input resistance of CA3130 opamp permits use of high RC ratios in timing circuits, to give pulse period range of 4 μs to 1 s with switch-selected capacitors.- Circuit Ideas for RCA Linear ICs, RCA Solid State Division, Somerville, NJ, 1977, p5. (View)
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Published:2009/7/14 4:06:00 Author:May
Makes use of proportional relationship between input current li and amplifier input bias current lABC of CA3094 programmable opamp. Linearity is within 1% over middle half of characteristic. Circuit can be used for voltage input if voltage is applied to pin 5 through appropriate dropping resistor R. Output is square wave. - Circuit Ideas for RCA Linear ICs, RCA Solid State Division, Somerville, NJ, 1977, p4. (View)
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