Electronics & Electricals

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3G/4G MIMO Broadband Panel Antenna is a high-gain (14–15 dB), directional antenna engineered to improve LTE/UMTS signal ...
17/07/2026

3G/4G MIMO Broadband Panel Antenna is a high-gain (14–15 dB), directional antenna engineered to improve LTE/UMTS signal reception and transmission. By utilizing MIMO (Multiple Input Multiple Output) technology, it enhances signal strength, increases data throughput, extends coverage, and reduces multipath fading.

Illustration showing the apparent geostationary satellite arc as viewed from Earth, including the orbital slots (longitu...
16/07/2026

Illustration showing the apparent geostationary satellite arc as viewed from Earth, including the orbital slots (longitude positions) of communication satellites used for satellite dish alignment and antenna pointing.

This circuit is a single-transistor LC tuned oscillator with capacitive feedback. The oscillation frequency is determine...
16/07/2026

This circuit is a single-transistor LC tuned oscillator with capacitive feedback. The oscillation frequency is determined by L1 (220 µH) and the variable capacitor CV1, while C2 provides the RF feedback necessary to sustain oscillation. Audio applied to the transistor base amplitude-modulates the RF carrier, producing a low-power Medium Wave (MW) AM signal.

Converts 100 mV–2 V sinusoidal input signals into TTL-compatible rectangular output signals over a frequency range of ap...
15/07/2026

Converts 100 mV–2 V sinusoidal input signals into TTL-compatible rectangular output signals over a frequency range of approximately 100 kHz to 80 MHz. The high-speed BFR93A transistor provides fast switching, while the 50 Ω input ensures proper impedance matching for coaxial cable applications. Ideal for frequency counters, digital logic, and RF signal interfacing.

800–1000 MHz Active UHF Active Antenna: A MAR-6 MMIC low-noise amplifier mounted at the reflector antenna feed point pro...
15/07/2026

800–1000 MHz Active UHF Active Antenna: A MAR-6 MMIC low-noise amplifier mounted at the reflector antenna feed point provides ~20 dB broadband gain with 50 Ω matching, while a bias-tee enables +12 VDC power over the same coaxial cable for enhanced weak-signal UHF reception.

Coaxial cables for HAM Radio.
14/07/2026

Coaxial cables for HAM Radio.

A compact 3V FM Bug transmitter based on the BFR93 RF transistor, operating across the 88–108 MHz FM broadcast band. The...
13/07/2026

A compact 3V FM Bug transmitter based on the BFR93 RF transistor, operating across the 88–108 MHz FM broadcast band. The LC-tuned oscillator provides stable VHF operation, while direct electret microphone modulation enables low-power wireless audio transmission with a typical line-of-sight range of up to 100–300 metres, depending on antenna design, tuning, and operating conditions.

SD Card Communication Protocol: Supports both native SD mode and SPI mode, enabling reliable high-speed serial communica...
13/07/2026

SD Card Communication Protocol: Supports both native SD mode and SPI mode, enabling reliable high-speed serial communication with microcontrollers and embedded systems. The shared pin architecture (CMD/DAT, CLK, VDD, VSS) allows flexible interfacing, while SPI mode simplifies implementation using CS, DI, DO, and SCLK signals for efficient data transfer and storage applications.

High-Sensitivity RF Field Strength MeterDesigned for detecting very weak RF signals, this meter is ideal for QRP operati...
12/07/2026

High-Sensitivity RF Field Strength Meter
Designed for detecting very weak RF signals, this meter is ideal for QRP operation, low-power transmitter alignment, antenna tuning, and RF circuit testing. A voltage doubler detector and LM386 DC amplifier provide exceptional sensitivity, while the bridge-balanced analog meter delivers accurate RF field strength indication without a direct electrical connection.

Classic transistorized CW sidetone oscillator employing RC phase-shift feedback to generate a low-distortion audio tone ...
10/07/2026

Classic transistorized CW sidetone oscillator employing RC phase-shift feedback to generate a low-distortion audio tone for operator monitoring.

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