Audio Circuit

50_W_TWO_STAGE_OUTPUT

Published:2009/7/15 2:54:00 Author:Jessie

Produces over 50-w rms audio power and has simple drive requirements.-High-Power Nu-Base Germanium Transistors (Delco Radio ad), Electronics, 39:7, p 20-21.   (View)

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NPN_PHONO_PREAMP

Published:2009/7/15 2:53:00 Author:Jessie

Input of 6 mv at 1 kc from magnetic cartridge gives 1 v output, which is 15 db below clipping level and 72 db above unweighted noise level. RIAA equalized output is within 1 db from 40 cps to 12 kc.- Transistor Manual, Seventh Edition, General Electric Co., 1964, p 257.   (View)

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500_MEG_D_C_INPUT_RESISTANCE

Published:2009/7/15 2:45:00 Author:Jessie

Bootstrap-collector circuit uses starved transistor to provide 500-meg d-c input resistance with 100-v input signal. A-c resistance is even higher, in the 1,000-megohm region at low audio frequencies.-B. M.Bramson, Starved Transistors Raise D-C Input Resistance, Electronics, 32:5, p 54-55.   (View)

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REDUCING_ODD_HARMONIC_DISTORTION

Published:2009/7/15 2:44:00 Author:Jessie

Grid-plate transfer characteristic of class-B amplifier is linearized to eliminate harsh odd-harmonic distortion, through use of compensation network having nonlinear transfer function. Distortion is cut to 2.6% at 16 w output.-B. Sklar, Reducing Distortion in Class.B Amplifiers, Electronics, 32:21, p 54-56.   (View)

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DARLINGTON_WITH_VOLTAGE_DIVIDER

Published:2009/7/15 2:42:00 Author:Jessie

Additional resistors in voltage divider reduce bias voltage, to simplify manufacture as integrated circuit. Useful up to 100 kc.-L.Pollock and R. Gutteridge, Latest Design Techniques for Linear Microcircuits, Electronics, 35:41, p 47-49.   (View)

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45_W_A_F_OUTPUT

Published:2009/7/15 2:40:00 Author:Jessie

Operates with convection cooling over temperature range of -10 to +50℃. Forward voltage drop of diodes decreases with increasing temperature, to hold emitter currents essentially constant. Uses quasi complementary symmetry.-M. B. Herscher, Designing Transistor A.F Power Amplifiers, Electronics, 31:15, p 96-99.   (View)

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SYNTHETIC_PUSH_PULL

Published:2009/7/15 2:29:00 Author:Jessie

Single transistor in sliding class-A output requires no input transformer, while approximating push-pull class-B output stage.-J. A. Worcester, One. Transistor Push-Pull, Electronics, 32:24, p 74.   (View)

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100_350_CPS_RECEIVER

Published:2009/7/15 2:28:00 Author:Jessie

Input signal from electrodes of crevasse detector is attenuated to suitable level at constant impedance of 1,000 ohms by T-pad and passed to 2N107 preamplifier whose supply voltage is stabilized at 5.8 v by reversed 71620 silicon diode shunt operating at zener point. Signal is then fed through bandpass L-C filter to amplifier, driver, and final 355 class A stage that drives recorder pen motor and relaymeler.-H. P. Van Eckhardt, Crevasse Detector Blazes Glacial Trails, Electronics, 31:3, p 63-65.   (View)

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CLASS_AB_PUSH_PULL_AUDIO

Published:2009/7/15 2:14:00 Author:Jessie

Sensistor R1 in a-c coupled driver compensates for effects of temperature on amplifier gain on amplifier gain. Negative feedback stabilizesfrequency and phase response. Circuit drives 20 decoders in Mercury spacecraftcommand receiver.-R. Elliott, First Details on Mercury Spacecraft Command Receiver,Electronics, 36;5, p 32-35.   (View)

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STABILIZED_MULTI_INPUT_AUDIO_PREAMP

Published:2009/7/15 2:07:00 Author:Jessie

Switch gives choice of input impedance, frequency response, and level-compensation network. R5 is tone control. Q4 Provides biascurrent to base of Q1 for stabilization-H.W. Parmer, Two Easy Ways to Stabilize Power -Transistor Hi-fi Amplifiers, Electronics,35:43,p 56-58.   (View)

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FET_OUTPUT_STAGE

Published:2009/7/15 2:56:00 Author:Jessie

Bootstrapped input, Darlington driver, and White follower give voltage gain of one, input impedance of 1 meg, and output impedance of 10 ohms.-B. Smifh, Low-Noise FETs Sound Good To Circuit Designers, Electronics, 37:31, p 58-62.   (View)

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120_150_MHz_FOR_TRANSISTOR_RADIO

Published:2009/7/15 5:02:00 Author:Jessie

Values shown cover bands for aircraft radio, 2-m amateur radio band, and other services. Circuit is regenerative converter, with incoming signal tuned by La-C2 and mixed in 2N2222 or equivalent transistor connected as oscillator with frequency controlled by L3 and C7. Difference frequency is adjusted to fall in standard broadcast band, for pickup by radio when converter is mounted close to ferrite loop. For local stations, antenna of converter can be 19-in length of wire. L2 and L4 are 100-μH chokes or about 20 in of fine wire wound on 100K resistor. -S. Kelly, Simple VHF Monitor, 73 Magazine, July 1976, p160.   (View)

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ADJUSTABLE_SQUARE_WAVES

Published:2009/7/15 4:57:00 Author:Jessie

Q1 and Q2 form flip-flop, with UJT Q3 connected as time delay. When power is applied, one flip-flop transistor conducts and C1 charges through one pot and diode. When C1 reaches firing voltage of UJT, it conducts and resulting output pulse triggers flip-flop, Sequence of events now repeats, with C1 charging through other diode. By proper selection of C1 and pot values, circuit becomes square-wave generator with each pot controlling duration of one half-cycle. With one pot replaced by fixed resistor, circuit becomes pulse generator with other pot controlling pulse-repetition rate. If equal-value fixed resistors replace pots and R1 is changed to pot, circuit becomes symmetrical square-wave generator with pot controlling frequency,-I. Math, Math's Notes, CQ, April 1974, p 64-65 and 91-92.   (View)

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20_W_SINGLE_ENDED_PUSH_PULL_OUTPUT

Published:2009/7/14 4:10:00 Author:May

Doubling number of output power tubes doubles ower output and halves loudspeaker impedance requirement. Separate cathode R-Cassembly for each pair of output tubes is recommended, but only one double choke isrequired. All pentodes are 6CW5.-J.Rodrigues De Miranda, Push-Pull Amplifiers DriveSpeaker Directly, Electronics, 31:29, p 76-79.   (View)

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100_MEG_INPUT_RESISTANCE

Published:2009/7/14 4:08:00 Author:May

High d-c input resistance is obtained with grounded-collector circuit operating under starved conditions. A-c input impedances of 100 megare obtain-able at audio frequencies, as required for photoconductive devices.-B. M.Bramson, Starved Transistors Raise D-C Input Resistance, Electronics, 32:5, p 54-55.   (View)

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2_STAGE_R_C_COUPLED_AUDIO_AMPLIFIER

Published:2009/7/14 4:07:00 Author:May

Input impedance for basic circuit is about 1300 hms. Design equations are given.－ Transistor Manual, Seventh Edition, General lectric Co., 1964, p 242.   (View)

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RING_COUNTER_USES_GATE_TURNOFFS

Published:2009/7/14 3:54:00 Author:May

Closing of set pulse input switch turns on first gto. Applying voltage to its lam load. Each shift pulse input then transfers conduction to next gto and lamp.-D.R. Grafham. Now the Gate Turnoff Switch Speeds up D-C Switching Electronics.37:12,p64-71   (View)

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DRIVER_FOR_FADIRA

Published:2009/7/14 3:54:00 Author:May

can be operated either in free-funning mode or in triggered orgated mode to produce Control voltage that will drive electronic fader. Correction network at lower right transfers control voltage to fader and minimizes switchingtransient.-E .de Boer, Electronics, Fader for Auditory Research,Electronics, 33:50,p 85-87.   (View)

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144_MHz_TO_28_MHz

Published:2009/7/15 5:22:00 Author:Jessie

Brings 2-meter band to input range of ordinary amateur receiver. Crystal eliminates need for multiplier stages that can generate spurious responses. Signal can be injected from external source if crystal is re moved. -Construction Hints for VHF Converters, QST, Sept. 1975, p 32-33 and 39.   (View)

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2_METER_FOR_10_MHz_IF

Published:2009/7/15 5:20:00 Author:Jessie

Designed for extreme linearity and selectivity while keeping noise figure below 5 dB Circuit has +15 dBm intercept point and 16-dB power gain, Five tuned circuits at input frequency give overall bandwidth of 4 MHz, with image suppression of 60 dB for 10-MHz IF and 80 dB for 30-MHz IF. Converter uses grounded-gate FET circuit. －U. Rohde, High Dynamic Range Two-Meter Converter, Ham Radio, July 1977,p55－57.   (View)

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