500-kHz Filter Circuit Simplified Schematic Diagram
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5W RF power amplifier
Numbered components are designated for PC-board layout purposes. C5 and C8 are disc ceramic capacitors. C6 and C7 are tantalum or electrolytic capacitors. R1, R2, and R3 are 1/4 W carbon composition resistors. Silver-mica capacitors may be substituted for polystyrene...
RF Signal Attenuator up to 30dB for 1MHz - 500MHz Input
This is a PIN diode-based RF signal attenuator circuit that operates with input frequencies ranging from 1 MHz to 500 MHz. PIN diodes are among the most commonly used components in RF applications.
The RF signal attenuator circuit utilizing PIN diodes...
Twin-t-notch-filter
This filter is utilized to reject or block a specific frequency or range of frequencies. Such filters are commonly integrated into audio and instrumentation systems to eliminate a single frequency, for instance, 60 Hz. Commercial-grade components with a tolerance of...
Simple RF Power Meter
Many beginners trying out their skill with QRP TX for the first time have to overcome many problems before they are able to come on the air. One usual complaint is that everything is working fine, but the signal is...
RF Dummy load
The load described here is capable of handling up to 10 watts of RF power for a couple of minutes and is designed for the widely used 50 ohms impedance. It consists of ten parallel connected 560 ohms 1 watt...
SYNCHRONOUS FILTER FOR ADF
Separates 130-cps motor drive voltage from voice frequencies in the output of an ADF receiver. P. V. Sparks, Servo Filter and Gain Control Improve Automatic Direction Finder, Electronics, 34:23, p 110-113.
The circuit described functions as a filter that effectively separates...
RF field strength meter
A simple Field Strength Meter consists of a small antenna, a detector diode, a resistor, a capacitor, and a micro ammeter. This circuit is sensitive enough to detect HF fields when positioned close to the transmitting antenna. The circuit functioned...
RF Combo
The RF Combo (A3016) integrates three circuits designed to support the development of circuit boards for Stage Four of a subcutaneous transmitter. The printed circuit board maintains the same outline as the RF Tester (A3014). The SAW Oscillator (A3016SO) replaces...
Interpolating Scanner Circuit
This design is for an interpolating scanner, a circuit featuring multiple signal inputs, a control voltage input, and a signal output. The output selectively transitions between inputs, smoothly fading from one to the next as the control voltage increases. A...