68-MHz oscillator circuit card schrematic diagram (assembly A12)
#68-MHz
#oscillator
#RF
#frequency generator
#schematic diagram
#assembly
#high frequency
#circuit card
No description available.
Visual modulation indicator
The brightness of the indicator lamp changes in accordance with the modulated RF signal. Adjust resistor R2 while the transmitter is on (modulated) until the lamp flashes in sync with the modulation.
Cl = 5 pF, C2 = 100 pF, Dl...
LC CHECKER
The circuit operates on the principle of the grid-dip or absorption effect, which takes place when a parallel resonant circuit is coupled to an oscillator operating at the same frequency. Transistor Q1 functions within a standard Colpitts oscillator circuit, maintaining...
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The circuit consists of a capacitance three-point oscillator, an isolation level, a voltage doubler rectifier circuit, a stereo sound circuit, and a flash display circuit. It can detect the quality of a crystal; a good crystal will emit a "Didi"...
RF Inductance Meter
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RF Actuated Keying Monitor
Sending Morse on a rig without a sidetone is not impossible, but is not particularly pleasant either. This battery-powered monitor has been designed to provide an audible indication of keying for those whose rigs lack a CW sidetone. Its sensor...
One Receiver
RF Cafe visitor David M. requested the scanning and posting of an article from the January 1963 edition of Popular Electronics, authored by Philip Hatfield from the Receiving Tube Department of General Electric. The article describes a straightforward design utilizing...
Inductance feedback oscillator circuit
A feedback oscillator circuit utilizing inductance is presented, featuring the 3DG3 transistor. The component parameters reference values include: 1) transistors 3DG6, 2) resistances R1 at 91 kΩ, R2 at 11 kΩ, and R3 unspecified, 3) capacitance values of C at...
3 level mini elevator semi finished needs debugging
A circuit design has been conceptualized, and an Assembly code program has been drafted for a three-level mini system.
The described circuit design focuses on a three-level mini system, which can be interpreted as a hierarchical structure where each level serves...
Local Oscillator For Double Balanced Mixers Circuit
This circuit includes an amplifier designed to deliver +10 dBm to an SBL series (Mini-Circuits) or a similar type of doubly-balanced mixer assembly. The circuit parameters are specified for 80 to 90 MHz crystals, although the values of the oscillator...