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Author Topic: wich potentiometer to use.  (Read 1559 times)
KP2BH
Member

Posts: 179




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« on: May 14, 2013, 11:31:34 AM »

 Undecided Hello friends:
I would like to add a separate volume to my hf radio speaker.
i now how to do it. my question is what value potentiometer to use
for this project? any help?
thanks es 73's
de kp2bh/ jimmy
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AA4PB
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Posts: 14894




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« Reply #1 on: May 14, 2013, 12:07:48 PM »

I would suggest an "L-Pad" control that matches the impedance of the speaker. An L-Pad maintains a constant impedance load on the receiver output regardless of the control setting. It also needs to be rated to handle the maximum power output of the receiver audio.

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Bob  AA4PB
Garrisonville, VA
KE3WD
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Posts: 5688




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« Reply #2 on: May 14, 2013, 02:17:22 PM »

I would suggest an "L-Pad" control that matches the impedance of the speaker. An L-Pad maintains a constant impedance load on the receiver output regardless of the control setting. It also needs to be rated to handle the maximum power output of the receiver audio.



This is the right way to do this. 

A low wattage mono L-pad like this one:

http://www.mcmelectronics.com/product/50-090?t=2&utm_expid=8634549-14&utm_referrer=http%3A%2F%2Felectronics.mcmelectronics.com%2Fsearch%3Fcataf%3D%26view%3Dlist%26w%3DL-pad%26x%3D0%26y%3D0

Wire it like this: 

http://colomar.com/Shavano/lpad.html


73
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KP2BH
Member

Posts: 179




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« Reply #3 on: May 14, 2013, 04:30:23 PM »

Thanks BOB an CLARK for the suggestions.
73's de kp2bh/jimmy
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