Silicon Diodes drop .6 volt per diode, so 3 will drop you to 13.7 VDC, the diode current rating needs to equal or exceed the current of the 15.5 volt power supply. A point to consider is how stable is the 15.5 voltage output based on load demand, i.e. if the batteries are very discharged such that they draw the supply voltage down during a recharge cycle you may encounter an issue with using the diodes, as they will reduce the available supply voltage during a deep charge condition.
Rob K7EI -----Original Message----- From: Ken [mailto:[EMAIL PROTECTED] Sent: Monday, July 26, 2004 9:37 AM To: [email protected] Subject: [Repeater-Builder] How to drop voltage using diodes Hi, I have a power supply with output voltage of 15.5v dc. I would like to install diodes on the power cable to drop the voltage to @13.8v dc. What size/type diodes would I need and where can I obtain it? I have backup batteries and I think the 15.5v is too much for the charging circuit. Thanx Ken 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/
