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Chip Amps Amplifiers based on integrated circuits

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Old 30th January 2013, 06:17 PM   #71
Kitax is offline Kitax  Latvia
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oh... i just dont want to use a 12 v battery, because of the price...
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Old 30th January 2013, 06:22 PM   #72
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Use a little PP3 nicad or whatever you can get. Or AA or AAA's.
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Old 30th January 2013, 06:35 PM   #73
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dont i need 12 volts?
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Old 30th January 2013, 06:39 PM   #74
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Most 12 volt relays will pull in at far less than 12 volts.
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Old 30th January 2013, 06:40 PM   #75
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oh... that explains a lot ^^
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Old 30th January 2013, 06:42 PM   #76
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You could use a 6 volt relay too and 4 AA's. Just adjust the values to suit.

As long as the normal (amp on) relay voltage is arranged to be higher than the battery by a couple of volts then the battery will charge correctly.
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Old 31st January 2013, 12:40 PM   #77
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you said: "Most 12 volt relays will pull in at far less than 12 volts."
how much less are we talking about?

heavent really delt with relays...
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Old 31st January 2013, 03:47 PM   #78
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I just tried it for real on a 12 volt relay and it pulls in reliably at 6.7 volts. Every relay will be different but you get the idea.
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Old 31st January 2013, 04:16 PM   #79
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mmm... so if i take a 6V relay, i could count on about 3-4V?
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Old 31st January 2013, 04:42 PM   #80
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Yes, a 6 volt relay would pull in with 4 AAA batteries which would give around 5v volts when fully charged. The resistor values would be chosen to give say 6.5 or 7 volts across the relay when the amp was running.
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