Receiver Battery Low Voltage Alarm Circuit

Under-Over-Voltage Beep for Manual Stabiliser

Manual stabilizers remain popular due to their straightforward construction, affordability, and high reliability, as they do not incorporate any relays. Manual stabilizers are widely utilized in various electronic applications, primarily due to their effective voltage regulation capabilities. These devices function by...

House Alarm Loop Circuit

This circuit features open and closed loop contacts (switches 1, 2, 3) that activate the alarm, which remains on for a duration of 5 to 10 minutes. The triggering delay for entrance and exit is set to 27 seconds. Additionally,...

Onkyo TX2500 mk II

An Onkyo TX2500 mk II receiver is being repaired for a friend, but it is experiencing issues with both AM and FM tuning, resulting in low reception quality. The Onkyo TX2500 mk II is a vintage audio receiver known for its...

5 volt ttl voltage monitor

This device is designed to control a supply voltage of +5 V. It provides information signals at TTL levels, accompanied by an LED display that indicates whether the voltage is within the nominal value or deviates from it. The device...

Schematic circuit diagram of low voltage and low voltage automatic conversion

The circuit is automatically converted to a low-voltage configuration. A 220V AC supply is stepped down by transformer T. After this, the breakdown voltage of diode VDw causes transistors VT1 and VT2 to turn off, resulting in the solid-state relay...

Battery voltage indication circuit

A battery voltage indication circuit that changes the status display. When the battery voltage is normal, an additional transistor drives an LED, which remains off. However, if the battery voltage falls below a critical threshold, the LED begins to flash,...

morning sunrise alarm

A project for a morning or sunrise alarm circuit that generates a beep-beep alarm sound and flashes an LED in response to sunlight. This sunrise alarm circuit is designed to provide a gentle awakening experience by utilizing both auditory and visual...

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...

1000Hz Pulsed Tone Alarm Circuit

IC1 generates a pulse that modulates the 1000-Hz tone generated by IC2. This circuit can be used to generate warning or alert signals. The circuit described consists of two integrated circuits (ICs), where IC1 is responsible for generating a pulse signal...