Chekhonte Posted November 3, 2008 Report Share Posted November 3, 2008 I'm still on my quest to build a large an powerful electromagnet. I'm wondering if I can put a non oscillating signal in one of the RCA jacks if my old crappy, "don't care if i blow it" amp will amplify the signal. Also how can I put in a non oscillating signal? Would a 1.5 volt battery work? Quote Link to comment Share on other sites More sharing options...
JBLoudG20 Posted November 3, 2008 Report Share Posted November 3, 2008 I'm not really following the logic here. To build an electromagnet, you just need a beefy power supply to apply current to a coil. The whole amplifier is completely unnecessary. I used to have a larly large, very strong electromagnet that ran on 12 volts, but I have absolutely no idea where it is now. I hurt myself many a times on that thing. Lots of fun! Quote Link to comment Share on other sites More sharing options...
Chekhonte Posted November 3, 2008 Author Report Share Posted November 3, 2008 Ah ok, I need to be able to adjust the current which an amplifier would do well. I could just put a potentiometer between power supply and it. I have a question for you, what type of power supplies would be best? Quote Link to comment Share on other sites More sharing options...
JBLoudG20 Posted November 3, 2008 Report Share Posted November 3, 2008 Really, anything cheap, that can deliver the required amount of current. Check your other thread, I posted a place that seemed to have a reasonable (IMO) price for electromagnets. Once you have one picked out that you think will be powerful enough, a PSU can be nailed down. Quote Link to comment Share on other sites More sharing options...
cclragnarok Posted November 3, 2008 Report Share Posted November 3, 2008 Ah ok, I need to be able to adjust the current which an amplifier would do well. I could just put a potentiometer between power supply and it. I have a question for you, what type of power supplies would be best? I'm not an expert here, but I really don't think that a regular pot would like the kind of current that would be going through it if you use it this way. Quote Link to comment Share on other sites More sharing options...
JBLoudG20 Posted November 4, 2008 Report Share Posted November 4, 2008 I'm not an expert here, but I really don't think that a regular pot would like the kind of current that would be going through it if you use it this way. Got that right. I'd probably PWM a Mosfet H-Bridge, if it were me. Quote Link to comment Share on other sites More sharing options...
Pars Posted November 4, 2008 Report Share Posted November 4, 2008 Yeah, audio pots typically don't like a bunch of DC on them. Non-oscillating = 0 Hz = DC. If your amp is DC coupled it likely will amplify DC. It may not like it much though, as I would think it is a very hefty duty cycle (100%)? Quote Link to comment Share on other sites More sharing options...
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