George, Thanks for helping me find those circuits. They do more than I had in mind, but they probably do what I need to do (instead of what I thought I need to do).
John -----Original Message----- From: [email protected] [mailto:[EMAIL PROTECTED] On Behalf Of George Henry Sent: Thursday, April 24, 2008 8:07 PM To: [email protected] Subject: Re: [Repeater-Builder] Control of a Fan There are 2 circuits for fan contollers on the Repeater Builder website at http://www.repeater <http://www.repeater-builder.com/projects/project-index.html> -builder.com/projects/project-index.html 73, George, KA3HSW / WQGJ413 ----- Original Message ----- From: John Transue <mailto:[EMAIL PROTECTED]> To: Repeater-Builder@ <mailto:[email protected]> yahoogroups.com Sent: Wednesday, April 23, 2008 4:56 PM Subject: [Repeater-Builder] Control of a Fan I have a fan cooling a remote base transceiver. The fan is on 24/7. I would like to have the fan on only when the transceiver PTT is active (active low). Alternatively, I would like to have the fan on only when the RB is commanded to RX/TX mode. There must be many simple solutions to this problem, but I am not competent to choose the proper components and design the circuit. The fan operates on 12 volts and draws 250 milliamps when running, perhaps more at start up. If someone can suggest a proper transistor and circuit to turn the fan on and off, I'd appreciate it. Thanks. John AF4PD __________ NOD32 2918 (20080303) Information __________ This message was checked by NOD32 antivirus system. http://www.eset.com
