5 sec delay ON timer .. #2

bertus

Joined Apr 5, 2008
21,524
Hello,

There are 2 times a R5 in the schematic.
One on the base of the first transistor and one in the collector or emitor (depending wich schematic you follow) of the first transistor.
There are also no values for the second R5 and R6.

Bertus
 

eetech00

Joined Jun 8, 2013
2,568
please can someone help me with this circuit? I want all values of the components for 3-5sec delay before on circuit

Mod: link to old thread.
https://forum.allaboutcircuits.com/threads/5-sec-delay-on-timer.76837/post-542184

View attachment 221514
Hi

Here is an alternate circuit that operates using 12v zener regulator and 12v relay.
Delay on is adjustable from ~3-5 seconds.

If you want the relay to energize at power on, de-energize after timeout:
remove 12v connection to relay, then connect relay to ground
reverse the diode D1 connections at relay (cathode to "out", anode to ground).

1604596096916.png
 
Last edited:
Top