Quick electronics question - DiscussWorldIssues - Socio-Economic Religion and Political Uncensored Debate

**Siliespiriulk** · 03-24-2008, 06:13 PM

Been a VERY long time but, as has been said, it would appear the R1 resistor will be tailored to match the microphone characteristics for the required input signal strength.
May pay to double check the microphone operating type you intend using, as it may not be required..

**engacenus** · 11-03-2008, 08:24 AM

Just looking at this sound operated circuit...

http://www.zen22142.zen.co.uk/Circui...ng/soundsw.htm

and am thinking that the 'suitable value' for R1 will essentially control the level of sound at which the circuit will operate? also - i have no need for a relay so i can just leave that out of the circuit?

many thanks peeps

**Clilmence** · 11-03-2008, 09:05 AM

It should according to my present recollection, of course I was at the pub earlier...

If the transistor at the output of the circuit can handle the current needed, there's no need for the relay.

**engacenus** · 11-03-2008, 09:11 AM

It should according to my present recollection, of course I was at the pub earlier...

If the transistor at the output of the circuit can handle the current needed, there's no need for the relay.

thank you kind sir...

feel free to check back once the toxins are cleared from your system!! :P

03-24-2008, 06:13 PM	#1
Siliespiriulk Join Date Oct 2005 Posts 660 Senior Member	Been a VERY long time but, as has been said, it would appear the R1 resistor will be tailored to match the microphone characteristics for the required input signal strength. May pay to double check the microphone operating type you intend using, as it may not be required.. Share Share this post on Digg Del.icio.us Technorati Twitter
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11-03-2008, 08:24 AM	#2
engacenus Join Date Oct 2005 Posts 494 Senior Member	Quick electronics question Just looking at this sound operated circuit... http://www.zen22142.zen.co.uk/Circui...ng/soundsw.htm and am thinking that the 'suitable value' for R1 will essentially control the level of sound at which the circuit will operate? also - i have no need for a relay so i can just leave that out of the circuit? many thanks peeps Share Share this post on Digg Del.icio.us Technorati Twitter
	Quote

11-03-2008, 09:05 AM	#3
Clilmence Join Date Nov 2005 Posts 421 Senior Member	It should according to my present recollection, of course I was at the pub earlier... If the transistor at the output of the circuit can handle the current needed, there's no need for the relay. Share Share this post on Digg Del.icio.us Technorati Twitter
	Quote

11-03-2008, 09:11 AM	#4
engacenus Join Date Oct 2005 Posts 494 Senior Member	It should according to my present recollection, of course I was at the pub earlier... If the transistor at the output of the circuit can handle the current needed, there's no need for the relay. thank you kind sir... feel free to check back once the toxins are cleared from your system!! :P Share Share this post on Digg Del.icio.us Technorati Twitter
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