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LM555 Voltage Doubler

This circuit shows the voltage doubler working with a 555. LM555 has good drive 200mA, both Vcc and ...
 

555 based Reset Generator

This circuit is a part of an older one which has been removed. I have taken a snapshot of a part to...
 

Astable Multivibrator

The 555 Astable oscillator gives a square wave output at pin 3, The output drives two LEDs, LED1 lig...
 

Drive SCR thyristor with 555

this circuit gives a burst of pulses to fire 2 SCRs, when pin 4 is taken to 12V the SCR is turned on...
 

OR gate with two 555

this shows how to OR gate two 555, when one 555 cycles at a low frequency a valve turns on an off, t...
 

555 watchdog for uC and uP systems

when the microcontroller hangs due to a spike, EMI or RFI etc. the 7555 will reset the uC, if proper...
 

Fixed frequency with variable duty cycle with 555

this circuit is based on a very old application note from exar, in this the frequency is fixed by IC...
 

Pulse width modulation using 555

IC1 astable gives a fixed square wave at pin 3, C1 and R1 derive uS trigger pulses from IC1 and this...
 

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