A arnab321 New Member May 26, 2011 #1 im looking for a very simple time delay circuit... say it would light up an led after a second when the circuit is closed.
im looking for a very simple time delay circuit... say it would light up an led after a second when the circuit is closed.
Nigel Goodwin Super Moderator Most Helpful Member May 26, 2011 #3 Try googling for 'monostable multivibrator', a simple two transistor circuit.
A arnab321 New Member May 26, 2011 #4 well, but i need the led constantly ON after the initial time delay.
A arnab321 New Member May 26, 2011 #5 Nigel Goodwin said: Try googling for 'monostable multivibrator', a simple two transistor circuit. Click to expand... kk i get it
Nigel Goodwin said: Try googling for 'monostable multivibrator', a simple two transistor circuit. Click to expand... kk i get it
A arnab321 New Member May 26, 2011 #6 will 2 STC945 transistors be okay for this? and is it necessary that we have to use 2 same transistors?
will 2 STC945 transistors be okay for this? and is it necessary that we have to use 2 same transistors?
k7elp60 Active Member May 26, 2011 #7 arnab321 said: im looking for a very simple time delay circuit... say it would light up an led after a second when the circuit is closed. Click to expand... Here is a circuit with one transistor. Change the capacitor to a 2200uF if you want about 2 sec. Attachments delay led on.png 9.2 KB · Views: 336
arnab321 said: im looking for a very simple time delay circuit... say it would light up an led after a second when the circuit is closed. Click to expand... Here is a circuit with one transistor. Change the capacitor to a 2200uF if you want about 2 sec.