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ersa191 24th December 2012 07:06 PM

simple_delay
 
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Can I use this circuit as simple delay circuit for relay and can I change specified transistors with ordinary like bc550/546/2N5551 etc...And what components should I change except capacitor lets say that delay would be 3 sec. I would put there 47uF is that OK?

Thanks

CBS240 24th December 2012 07:51 PM

What is the purpose? and if it is to delay turn on, what about turn off delay?

ersa191 24th December 2012 08:03 PM

Quote:

Originally Posted by CBS240 (Post 3298066)
What is the purpose? and if it is to delay turn on, what about turn off delay?

The purpose is bypassing NTC thermistor, after lets say 3sec or more, wail the power supply charges capacitors

dangus 26th December 2012 11:20 AM

I think the first transistor is being used as a zener, so any substitution would have to take the zener characteristic into account. Maybe it's better to use a 555, or an op-amp or comparator with hysteresis.

ersa191 26th December 2012 11:29 AM

Quote:

Originally Posted by dangus (Post 3299380)
I think the first transistor is being used as a zener, so any substitution would have to take the zener characteristic into account. Maybe it's better to use a 555, or an op-amp or comparator with hysteresis.

I found all answers on this page
http://www.bowdenshobbycircuits.info/page2.htm


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