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Base details of High Frequency Induction Heating – Circuit Schematic
Base details of High Frequency Induction Heating
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am fm radio tuner multiplex decoder – Circuit Schematic
am fm radio tuner multiplex decoder
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Command receivers – Circuit Schematic
Command receivers
The Command radio is a description of the radio function, rather than a specific model. The "Command" function was to communicate between aircraft. The "Liaison...
regenerative radio receivers – Circuit Schematic
regenerative radio receivers
A regenerative radio receiver is unsurpassed in comparable simplicity, weak signal reception, inherent noise-limiting and agc action and, freedom from overloadi...
PHANTASTRON AFC – Circuit Schematic
PHANTASTRON AFC
Pentode is astable phantastron during radar search, and d-c amplifier during lock-on when pentode furnishes direct control of klystron repeller. -NBS, "Handbook...
DEVIATION METER – Circuit Schematic
DEVIATION METER
You can use this circuit in most FM VHF receivers; the hookup is off the FM discriminator. Because every signal transmitted has its own deviation signature, thi...
LOW NOISE 420 MHz ATV RECEIVER CONVERTER – Circuit Schematic
LOW NOISE 420 MHz ATV RECEIVER CONVERTER
L1, Q1, L2, and L3 compose an RF amp’’fter stage that feeds Ml, a doubly balanced mixer. Q4 is alocal oscillator stage In the 375-MHz range Signals h the 42...
DOUBLE SIDEBAND SUPPRESSED CARRIER MODULATOR – Circuit Schematic
DOUBLE SIDEBAND SUPPRESSED CARRIER MODULATOR
The basic current allows no carrier to be present in the output. By adding offsets to the carrier differential pairs, controlled amounts of carrier appear at th...
BALANCED MODULATOR – Circuit Schematic
BALANCED MODULATOR
When the carrier level is adequate to switch the cross-coupled pair of differential amplifiers, the modulation signal, which has been applied to the gate, will ...
455 kHz IF WITH AF COMPRESSOR – Circuit Schematic
455 kHz IF WITH AF COMPRESSOR
Combination of IF amplifier, audio compressor, tunable audio filter, and audio output system operates from single supply. Compressor and filter each use N5558V ...
FET BALANCED MODULATOR FOR SSB – Circuit Schematic
FET BALANCED MODULATOR FOR SSB
AF modulating signal is applied to gates of matched FETs in push-pull through T1 having accurately center-tapped secondary, and RF carrier is applied to sources...
SUPPRESSED CARRIER MODULATOR – Circuit Schematic
SUPPRESSED CARRIER MODULATOR
Mullard TCA240 dual balanced modulator-demodulator provides suppression of carrier frequency at output, as required for SSB or DSB operation of transmitter. Bia...
43925 MHz ATV DOWNCONVERTER – Circuit Schematic
43925 MHz ATV DOWNCONVERTER
Most ATV (Amateur Television] transmitters transmit a DSB signal and commercial television stations use a VSB (Vestigial Sideband) signal. This fact is made use...
WIRELESS MICROPHONE – Circuit Schematic
WIRELESS MICROPHONE
An op-amp IC (741) amplifies the audio signal from MIC1, and R12 controls its gain. Audio is fed to the oscillator circuit Q1 and related components. D2 is a va...
THREE INPUT TWO PENTODE MIXER – Circuit Schematic
THREE INPUT TWO PENTODE MIXER
Distance markers and iff signals are inserted at separate grids on one tube, while radar video from input 3 is impressed on control grid of other pentode. -NBS,...
PENTODE MIXER – Circuit Schematic
PENTODE MIXER
Negative video plus iff signals are inserted at grid, while range strobe, from cathode output of blocking oscillator, is applied to cathode. -NBS, "Handbook Pre...
195 KC SONAR F M MODULATOR – Circuit Schematic
195 KC SONAR F M MODULATOR
Used in recording signals from active sonar on magnetic tape, for later playback to control land-based sonar used in training operators. Modulator is basically ...
BALANCED MODULATOR DEMODULATOR – Circuit Schematic
BALANCED MODULATOR DEMODULATOR
Achieves high carrier and modulation suppression by using closely matched diodes and providing R1 for amplitude adjustment and coaxial line for phase adjustment...
FM HF OSCILLATOR WITH NO VARACTOR – Circuit Schematic
FM HF OSCILLATOR WITH NO VARACTOR
Instead of using a varactor to frequency-modulate a high-frequency oscillator, this circuit uses base-charging capacitance modulation. Consequently, the large v...
FM SIGNAL GENERATOR OR WOBBULATOR – Circuit Schematic
FM SIGNAL GENERATOR OR WOBBULATOR
With sine-wave input, RCA CA3046 transistor array connected as VCO can be used as low-distortion FM signal generator. With sawtooth input, same arrangement serv...