I picked up an electronic load on Ebay a number of years ago, and have gotten more use out of it than I ever thought I would. Here's a well-done article on building an electronic load. The general design could be easily expanded to handle higher current by using a beefier transistor and/or multiple devices.
http://www.siliconchip.com.au/cms/A_30506/article.html --- Jeff > -----Original Message----- > From: Repeater-Builder@yahoogroups.com > [mailto:[EMAIL PROTECTED] On Behalf Of Tony King, W4ZT > Sent: Sunday, February 12, 2006 9:06 AM > To: Repeater-Builder@yahoogroups.com > Subject: Re: [Repeater-Builder] Cheap "Tunnel" Heatsink > > > Here is my version of a 12 Volt dummy load: > <http://astron.w4zt.com/dload.html> > > And, for those of you that are like me and would like to load > test HIGH > VOLTAGE supplies, here's my high voltage dummy load: > <http://gs35b.com/hvload/index.html> > > Careful... either of them can burn you... BAD. The high > voltage dummy > load can KILL you if you get into it. > > 73, Tony W4ZT > > > Mike Morris wrote: > > Years ago I saw a homebrew version of that: > > > > Twenty tungsten auto headlights in a metal box, with a switch > > for each bulb, and a couple of heater blowers. Bulbs were > > 50 cents at the auto junkyard, as were the headlight switches. > > They were wired so that the parking light position (half-way out) > > lit up the low beam, and the headlight position (all the way out) > > lit up the high beam as well. > > > > A regular wall thermostat was used along with a relay to run > > the heater blowers (off of the 12v input). > > > > Cheap to build and worked just fine.... > > > > Mike WA6ILQ > > > > > > At 10:46 PM 2/11/06, you wrote: > > > >> Brett, I have a copy of a commercial "Load Bank" which is > nothing more > >> than > >> a bunch of large resistors in a case controlled by switches. > >> I'll dig it out and scan it for you.... > >> > >> These people get $3,000.00 for this package ! I have the stuff to > >> build one > >> and have about $75.00 invested so far..... > >> > >> 73 John VE3AMZ > >> > >> ----- Original Message ----- > >> From: Brett <mailto:[EMAIL PROTECTED]> > >> To: Repeater-Builder@yahoogroups.com > >> <mailto:Repeater-Builder@yahoogroups.com> > >> Sent: Saturday, February 11, 2006 9:28 PM > >> Subject: Re: [Repeater-Builder] Cheap "Tunnel" Heatsink > >> > >> Hi guys does anyone have that circuit diagram I need > to build one > >> to test 12 to 60 volt supply. > >> Thanks in advance. > >> Brett > >> > >> ----- Original Message ----- > >> From: [EMAIL PROTECTED] <mailto:[EMAIL PROTECTED]> > >> To: Repeater-Builder@yahoogroups.com > >> <mailto:Repeater-Builder@yahoogroups.com> > >> Sent: Sunday, February 12, 2006 10:01 AM > >> Subject: Re: [Repeater-Builder] Cheap "Tunnel" Heatsink > >> > >> In a message dated 2/11/2006 3:10:54 PM Eastern Standard Time, > >> [EMAIL PROTECTED] <mailto:[EMAIL PROTECTED]> writes: > >> http://www.ve3tjd.com/pictures/tech%20stuff/ > >> > >> What a perfect heatsink for that variable power supply > load that was > >> bouncing around on R-B about a year or two ago. You could > vary the Amp > >> Load on your power supply using a variable pot control. > >> Gary K2UQ > > > > > > Yahoo! Groups Links > > > > > > > Yahoo! Groups Links <*> To visit your group on the web, go to: http://groups.yahoo.com/group/Repeater-Builder/ <*> To unsubscribe from this group, send an email to: [EMAIL PROTECTED] <*> Your use of Yahoo! Groups is subject to: http://docs.yahoo.com/info/terms/
