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Old 24th December 2012, 06:06 PM   #1
ersa191 is offline ersa191  Equatorial Guinea
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Default simple_delay

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?

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Old 24th December 2012, 06:51 PM   #2
CBS240 is offline CBS240  United States
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What is the purpose? and if it is to delay turn on, what about turn off delay?
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Old 24th December 2012, 07:03 PM   #3
ersa191 is offline ersa191  Equatorial Guinea
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Quote:
Originally Posted by CBS240 View Post
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
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Old 26th December 2012, 10:20 AM   #4
dangus is offline dangus  Canada
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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.
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Old 26th December 2012, 10:29 AM   #5
ersa191 is offline ersa191  Equatorial Guinea
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Originally Posted by dangus View Post
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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