is it okay to use an X1/X2 film cap in this circuit... - diyAudio
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Old 6th July 2007, 12:28 PM   #1
jarthel is offline jarthel  Australia
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Default is it okay to use an X1/X2 film cap in this circuit...

http://mitglied.lycos.de/Promitheus/delay.jpg

I'm looking to use the film cap in place of the .33uF 250V cap.

thank you for the reply
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Old 6th July 2007, 12:44 PM   #2
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You should use an X1 or X2 rated cap for this circuit. BTW, this is from Elektor. I have used this successfully for years in an amp. If you are interested I have a PCB for this which also incorporates a remote power on circuit (you can use any switch to power on). Let me know if you want more info.
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Old 6th July 2007, 12:53 PM   #3
jarthel is offline jarthel  Australia
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Quote:
Originally posted by smithy666
You should use an X1 or X2 rated cap for this circuit. BTW, this is from Elektor. I have used this successfully for years in an amp. If you are interested I have a PCB for this which also incorporates a remote power on circuit (you can use any switch to power on). Let me know if you want more info.

quite interested. send me a mail.

Thank you
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Old 6th July 2007, 01:03 PM   #4
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drop me an e-mail @ atomicnirvana@gmail.com and I'll send you schematic + pcb layout
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Old 6th July 2007, 01:03 PM   #5
jarthel is offline jarthel  Australia
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is the cap value across the 2x 470Kohm important?

thanks again
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Old 6th July 2007, 01:12 PM   #6
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Yes, crucial. Its impedance is about 10k at 50Hz, which drops most of the mains voltage, effectively reducing it to around 24V (less the diode drop and small drop from the series resistor) to drive the relay coil.
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Old 6th July 2007, 01:12 PM   #7
jarthel is offline jarthel  Australia
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Quote:
Originally posted by smithy666
email sent.

thank you.
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Old 6th July 2007, 01:16 PM   #8
jarthel is offline jarthel  Australia
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Quote:
Originally posted by smithy666
Yes, crucial. Its impedance is about 10k at 50Hz, which drops most of the mains voltage, effectively reducing it to around 24V (less the diode drop and small drop from the series resistor) to drive the relay coil.

so in the elektor circuit, a 24V relay is used?

thanks again
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Old 6th July 2007, 01:19 PM   #9
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Yes, it is a 24V relay. I've sent through the files to you
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Old 6th July 2007, 01:23 PM   #10
jarthel is offline jarthel  Australia
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Quote:
Originally posted by smithy666
Yes, it is a 24V relay. I've sent through the files to you
can you tell me (or point me to guide) on how to calculate the resulting voltage by changing the value of the 330nF cap?
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