Dog repellent project circuit
#ultrasonic
#sound emitter
#animal deterrent
#sensor
#security
#audio
#frequency generator
#outdoor safety
#motion detection
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Pots water alarm circuit
The flowers in pots require watering, as relying solely on the observation of moist soil surfaces can be unreliable. To address this issue, a flower watering indicator has been developed. This circuit includes a field effect transistor (VT1), a second...
UltraSonic Radar
This project has numerous practical applications in security and alarm systems for homes, shops, and vehicles. It consists of a set of ultrasonic receivers and transmitters operating at the same frequency. When movement occurs in the area monitored by the...
Audio Graphic Equaliser
Cleaned Input:
Description: Audio graphic equalizers are very common as commercial products (for Hi-fi, car audio and stage use) but circuits for them are very rarely published. I didn't design this one but it's really very simple. The details shown...
LM390 Bass Amplifier
This circuit is a mono audio amplifier that will boost low frequencies as you see at the frequency response. The circuit is suitable for driving a subwoofer speaker for example. The output power of the circuit is about 1 Watt...
electronic hotel door vulnerability using stealth lock circuit
The term "pentester" refers to a penetration tester, individuals who assess security vulnerabilities. Many high-end hotels globally depend on keycard locks for securing hotel rooms. However, recent incidents of theft have shown that these locks may not be as secure...
Ultrasonic Transmitter Sensor Switch circuit
This circuit explains alternate wireless switching using an ultrasonic sensor. The distance of the switching range should be more than 10 meters.
The described circuit employs an ultrasonic sensor to facilitate wireless switching, allowing for the activation or deactivation of devices...
Ultrasonic transmitter circuit
The ultrasonic transmitter circuit T-40-16, along with various discrete components, functions as a feedback sensor. The transistors VT1 and VT2 create a robust positive feedback oscillator that converts an electric signal into an ultrasonic oscillation signal, with the oscillation frequency...
UnDecima Audio Output from Arduino
There is a project involving an Arduino that outputs audio signals to USB speakers using 10-bit PWM. Initially, the sound quality produced via PWM was unsatisfactory due to the limited processing speed of the Arduino, which is insufficient for high-frequency...
Ultrasonic Beam Barrier Circuit
This circuit generates inaudible ultrasound to create a barrier across an entry point. When the circuit detects a disruption in the sound barrier, it triggers a loud alarm to indicate the entry of a person. This system can be utilized...