timer switch not working - Electronic Circuits Projects Diagrams Free

vinke · 30th January 2007, 03:10 PM

hi guys,
got a problem with some timer switches(220VAC,24VDC).
the problem is that they seem to work at times but sometimes not.
They are on-delay timers , so after some pre-selected time the normally closed switch should open and the normally open should close and all this happen when the timer is supplied with voltage,and to re-initialise them the voltage should be removed.what actully happen is that when its time for the switch to close or open it just oscillate from closed to open position twice or sometimes thrice and then regain its normal behavior.
There is a 16-stage binary counter(MC14541BCP) and a transistor(C5468, by the way someone have its datasheet? ive searched but not found.) which i think might be causing this.the timer works also with dc supplies(24V),and it works perfectly.Someone have an idea what might be causing this?

kchriste · 31st January 2007, 02:23 AM

The transistor is probably a 2SC5468 so search for that.

Quote:

the timer works also with dc supplies(24V),and it works perfectly.

It is likely that the 220Vac to 24VDC power supply part of the circuit is defective?

on1aag · 31st January 2007, 02:35 AM

Hi Vinke,

The datasheet of the 2SC5468 can be found here:

http://www.alldatasheet.com/view.jsp?Searchword=2SC5468

on1aag.

vinke · 31st January 2007, 02:24 PM

thks,
ive re-soldered every point on the board and its working now,surely a dry point was causing this.

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30th January 2007, 03:10 PM	(permalink)
vinke	timer switch not working hi guys, got a problem with some timer switches(220VAC,24VDC). the problem is that they seem to work at times but sometimes not. They are on-delay timers , so after some pre-selected time the normally closed switch should open and the normally open should close and all this happen when the timer is supplied with voltage,and to re-initialise them the voltage should be removed.what actully happen is that when its time for the switch to close or open it just oscillate from closed to open position twice or sometimes thrice and then regain its normal behavior. There is a 16-stage binary counter(MC14541BCP) and a transistor(C5468, by the way someone have its datasheet? ive searched but not found.) which i think might be causing this.the timer works also with dc supplies(24V),and it works perfectly.Someone have an idea what might be causing this? Last edited by vinke; 30th January 2007 at 03:56 PM.

31st January 2007, 02:35 AM	(permalink)
on1aag	Transistor data sheet. Hi Vinke, The datasheet of the 2SC5468 can be found here: http://www.alldatasheet.com/view.jsp?Searchword=2SC5468 on1aag.

31st January 2007, 02:24 PM	(permalink)
vinke	thks, ive re-soldered every point on the board and its working now,surely a dry point was causing this.