Ensemble II VHF RX opamp
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RF circuits
A field strength meter utilizing a biased Schottky detector employs a temperature-compensated Schottky diode within an amplified, untuned field strength indicator powered by two AA cells. This device indicates the relative field strength of RF fields ranging from a few...
VHF Overtone Oscillator
VHF overtone crystals can be challenging to utilize due to the multiple frequencies at which the crystal can oscillate effectively. A typical 100 MHz, 5th-overtone crystal may oscillate at approximately 20 MHz, 60 MHz, 100 MHz, and even 140 MHz,...
LED RF Signal Strength Meter
RF Signal Strength Meter circuits are popular RF measurement devices. This circuit is one of the simplest but very useful circuits that satisfies your desired accuracy. The heart of measurement is high accuracy but easy to use Logarithmic Detector AD8313...
Ensemble II VHF RX rf
This stage begins at the VHF antenna. The incoming VHF RF signal is preamplified and filtered and presented as the "RF" signal to the ADE and Double Balanced Mixer (DBM). The mixer also accepts the Local Oscillator's output (before the...
MAX2620 10mhz To 1050mhz Integrated Rf Oscillator With Buffered Outputs
The MAX2620 integrates a low-noise oscillator with two output buffers in a cost-effective, plastic surface-mount, ultra-small uMAX package. This device combines functions that are typically achieved with discrete components.
The MAX2620 is designed for applications requiring precise frequency generation with minimal...
VHF preamplifier with BFY91
When the start switch is pushed, the output of the charger goes to 14.5 V. As the battery approaches full charge, the charging current decreases and the output voltage is reduced from 14.5V to about 12.5V, terminating the charging process....
Optimized 6/9 element VHF Yagi Antenna
The computer optimized 9 el. homebrew antenna is performing very well. I have made many long distance contacts using the ON6MU VHF Yagi antenna. I have the antenna located only 35 feet above the ground. More: The very first day...
Opamp VHF FM Transmitter
Integrated circuits (ICs) that were previously too costly for hobbyists are now more affordably priced. An example is the AD8099 from Analog Devices, which is available for only a few pounds. The AD8099 is a very fast operational amplifier (op-amp)...
Negative Supply From Single Positive Supply
Operational amplifiers (op-amps) are highly versatile components in electronic circuits. However, one significant limitation is their need for a dual power supply, which can restrict their use in applications where a dual supply is impractical or cost-prohibitive. The circuit presented...