Optical receiver
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Tuned radio frequency receiver
A tuned radio frequency (TRF) receiver is a radio receiver typically consisting of multiple tuned radio frequency amplifiers followed by circuits for detecting and amplifying the audio signal. A three-stage TRF receiver includes an RF stage, a detector stage, and...
A Simple 80M Direct Conversion Receiver
A few weeks ago, Jason NT7S mentioned the ZL2BMI DSB transceiver as a rig that might be of interest for building. He was correct; it had been seen in SPRAT, but for some reason, it had not been seriously considered...
136 kHz QRSS receiver
For digital modes, the ideal receiver should be straightforward, featuring front-end selectivity, manually adjustable gain, and an IF filter. Many functionalities found in HF receivers can be implemented through software. In the collection of components, there was a surplus 1.4...
Light-Controlled Oscillator Circuit
This circuit can be utilized as a light detector and potentially as a tool for individuals with visual impairments. The frequency of the oscillator is influenced by the level of illumination received by LDR4.
The circuit operates by employing a Light...
Super Light Sensor
This Super Light Sensor responds to minute fluctuations in light levels, automatically adjusting from approximately 200 lux to 60,000 lux (from a modestly lit room to direct sunlight). It has various potential applications, such as detecting a car entering a...
Light to Frequency converter
A simple light-to-frequency converter circuit with a diagram and schematic. It is used as a light intensity measurement circuit. The design utilizes the TLC555, a CMOS version of the NE555 timer IC.
The light-to-frequency converter circuit is designed to convert varying...
Digital Light Sensor
The Intersil ISL29001 is a digital light sensor designed to measure light intensity and easily interface with a microcontroller.
The Intersil ISL29001 is a highly integrated digital light sensor that operates using a photodiode and an analog-to-digital converter (ADC) to provide...
Automatic light activated switch circuit
The circuit is designed to switch off a specific lamp or a group of lamps based on varying ambient light levels. Once constructed, it will turn off a lamp at dawn and turn it on at dusk. The power supply...
5474 tips
The Aristo ART-5474 Accessory Panel is a complete receiver designed to control accessories using buttons A through E on the Train Engineer transmitter. The ART-5474 is capable of controlling two turnouts, one constant load such as lights, and can trigger...