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On And Off Button – Circuit Schematic
On And Off Button
In this simple circuit we give the chip a little more attention than usual. It is astonishing what can be built with a 555. We are always infatuated with.....
Laser Controlled ON - OFF Switch – Circuit Schematic
Laser Controlled ON - OFF Switch
This circuit is built around a 555 timer using very few components. Since the circuit is very simple, even a novice can easily build it and use it as a co.....
Generation of 1-Sec Pulses Spaced 5-Sec Apart – Circuit Schematic
Generation of 1-Sec Pulses Spaced 5-Sec Apart
This circuit using a dual-timer NE556 can produce 1Hz pulses spaced 5 seconds apart, either manually or automatically. IC NE556 comprises two independent.....
555 Timer Clap Switch – Circuit Schematic
555 Timer Clap Switch
This 555 timer clap switch circuit electronic project is designed using some common electronic parts. This 555 timer clap switch circuit electronic projec.....
555 Timer Circuit With Variable On/Off Times – Circuit Schematic
555 Timer Circuit With Variable On/Off Times
This circuit enables the on/off times of a 555 timer to be independently varied over a wide range. This is not possible with a conventional 555 circuit wi.....
Electronically Designed Dice Game Circuit by LM555 – Circuit Schematic
Electronically Designed Dice Game Circuit by LM555
The objective of the circuit is to build an electronic dice based on the functions of a 555 timer integrated circuit that operates in the astable mode. LM.....
555 Timer as an Analog to Digital Converter – Circuit Schematic
555 Timer as an Analog to Digital Converter
This 555 timer based circuit is a kind of voltmeter, also an analog to digital converter, that converts the analog input voltage to digital output pulses ...
Non-standard 555 Astable Multivibrator – Circuit Schematic
Non-standard 555 Astable Multivibrator
I need to make a square-wave with variable frequency, but 50% duty cycle. The 555 timer seemed like a good idea, but with the normal astable multivibrator circu...
555 monostable pulse width modulator – Circuit Schematic
555 monostable pulse width modulator
In the 555 datasheet they have a pulse width modulation circuit similar to this with the only difference being that they have pin 5 labelled as `audio .....
555 configured as in this schematic – Circuit Schematic
555 configured as in this schematic
It is clearly not a standard astable multivibrator. Does nayone recognize this configuration? I would like to understand it better.....
555 timer astable multivibrator – Circuit Schematic
555 timer astable multivibrator
In the following astable multivibrator circuit, in some books, it is mentioned that the duty cycle id d=( R1+R2)/(R1+2*R2) in some other books, it is.....
Simple Low-cost Stopwatch – Circuit Schematic
Simple Low-cost Stopwatch
A simple circuit of a stopwatch that can count up to 99 seconds. The circuit uses CD4060, CD4013, CD4033, LTS543 and some discrete components. A crystal-control...
SimpleTimer with Musical Alarm – Circuit Schematic
SimpleTimer with Musical Alarm
The circuit timer with musical alarm use famous CMOS oscillator/divider IC (IC1 ). Although this circuit operates in 9V its standby current drain is very low. T...
555 Timer As A Switch-Mode Power Supply – Circuit Schematic
555 Timer As A Switch-Mode Power Supply
Most switch-mode power supplies rely on a PWM (pulse-width-modulated) output that is controlled via voltage feedback. A 555-timer IC can inexpensively perform P...
MC74HC4538A Dual Precision Monostable Multivibrator Retriggerable Resettable – Circuit Schematic
MC74HC4538A Dual Precision Monostable Multivibrator Retriggerable Resettable
The MC74HC4538A is identical in pinout to the MC14538B. The device inputs are compatible with standard CMOS outputs; with pullup Resistors they are compatible w...
Single Digit E1T Clock – Circuit Schematic
Single Digit E1T Clock
To me the E1T counting tube is unmistakably one of the most intriguing tubes ever made. It was invented and developed into a product by Philips in the period 19...
games timer 4 – Circuit Schematic
games timer 4
When the games timer is RESET, two things must happen. The 4017 counter must go back to zero and the 4060 astable/divider must go back to zero. (If we left the ...
555 Flip Flop Circuit Schematic – Circuit Schematic
555 Flip Flop Circuit Schematic
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24 Second Shot Clocks – Circuit Schematic
24 Second Shot Clocks
To start in 24 seconds; 24s LOAD SW and Reset SW should be push simultaneously. If not, the count will start in 99. Pulse input can be connected to 555 astable ...
Asymmetric Timers – Circuit Schematic
Asymmetric Timers
A simple astable timer made with the 555, the mark (on) and space (off) values may be set independently. The timing chain consists of resistors Ra, Rb and capac...