timer project
#timer
#555 timer
#pulse generator
#delay circuit
#timing circuit
#monostable
#astable
#clock circuit
No description available.
Designing 555 Astables
If an oscillator of a specific frequency and mark-to-space ratio is needed, the periodic time can be calculated from the required frequency, as well as the discharge and charge times using the formulas for tD and tC outlined in the...
A 555 four-base integrated circuit delay circuits
A 555 four-base integrated circuit delay circuit is designed to facilitate a transition from high to low output. When the button SB is pressed, the output is set to high, and after a specified delay, the output transitions to a...
Switching Delay Used by 555 Timer IC
The circuit described here was designed as an addition to a remotely controlled garage door opener. The problem was that a brief burst of interference, arising from a thunderstorm or a mains spike, was enough to trigger the mechanism, which...
Inductive switching power supply circuit diagram
The circuit consists of a 555 timer configured as an astable multivibrator along with resistors R1 and R2 and capacitor C1. It generates an oscillation frequency of approximately 10 kHz with a duty cycle close to 50%. Transistors VT2 and...
555 electronic circuit diagram of a Christmas tree
The circuit features a clock pulse generator and a pulse distribution circuit that drives the display circuit. It consists of a 555 timer and resistors RP1, R1, R2, along with capacitor C1, forming an astable multivibrator. The oscillation frequency is...
Timer with buzzer and optocoupler circuit
A small circuit designed for various time measurement applications. It features an audible sound signal from the buzzer BZ1 and has the capability to drive an external circuit through the optocoupler IC2, once the appropriate circuit is connected to contacts...
Delayed pulse generator
The circuit provides independent control of the initial delay and pulse rate. ICIc functions as a pulse generator, with its operation inhibited by the normally low output of ICla. When the circuit input transitions to low (e.g., when pressing PB1),...
audio frequency meter
This is a circuit for an audio frequency meter. This circuit utilizes a 555 IC configured as a monostable multivibrator (one-shot trigger). A monostable multivibrator can function as a frequency-to-voltage converter by producing a fixed pulse width, with the repetition...
555 Timer based Cellphone Miss-Call Device
This entry is for the international 555 Contest. The 555 timer chip has been in use for many years and is highly versatile. The concept of this project addresses the need for notification of an event while away from a...