Two Stage Time Delay circuit | Next Electronics

This 1 kHz linear-scale analog frequency meter circuit utilizes the 555 timer as a pulse counter. The frequency is displayed on meter M1, a 1 mA meter, which can be calibrated to indicate readings from 0 to 1 kHz. The circuit...

Touch SwitchCircuit using NE 555 IC

A touch switch circuit schematic utilizing a 555 integrated circuit (IC). When the touch plate is activated, a relay is switched ON for a predetermined duration, which can also be adjusted. The touch switch circuit employs a 555 timer IC configured...

555 Based Alarm Circuit

The alarm circuit utilizes a single 555 oscillator/timer (U1) that functions in both the alarm-trigger circuit and the entry-delay circuit. In this configuration, the trigger input of U1 at pin 2 is maintained in a high state through resistor R1....

555 simple electronic keyboard circuit

The controllable multivibrator, as illustrated in figure 14-40, consists of a 555 timer along with resistors RA, RP1, and capacitor C1. The oscillation frequency is influenced by the control voltage applied to pin 5. This control voltage is determined by...

Tele Timer Circuit

The circuit is designed around a 555 oscillator/timer, providing two distinct time periods. The longer time period can be adjusted between approximately 1 to 10 minutes, while the shorter time period is fixed at around three seconds. The operation of...

Delay On Circuit

Protect your LCD or Plasma TV with this small delay-on circuit. The SMPS-based power supply of these modern electronic devices is susceptible to voltage spikes. This delay-on circuit is designed to enhance the protection of LCD and Plasma TVs by mitigating...

astable mode of 555 timer

The schematic presented originates from buildcircuit.com. This circuit functions as a music generator, infrared transmitter, and LED blinker, depending on the values of R1, R2, and C1. A minor modification to the previous circuit allows it to operate as an...

Advanced LED Flasher with 555

This circuit uses three easily available 555 timer ICs. All three work as astable multivibrators. The first 555 has an on period and off period equal to 1 sec. This IC controls the on/ off periods of the other 2...

Optical switch detector with 555

When the phototransistor is struck by IR light, it conducts, and the voltage between the 1 MΩ resistor (arbitrary) and the phototransistor drops from VCC to lower values. When the voltage drops lower than VCC/3, the 555 is triggered and...