Very good point Don
John, WA5BXO -----Original Message----- From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On Behalf Of Donald Chester Sent: Sunday, January 02, 2005 6:04 PM To: [email protected] Subject: [AMRadio] Metering circuits One word of caution. If you use the above circuit with directly heated cathode tubes, be very careful to avoid shorting either side of the filament line to ground. I lost a plate meter when I accidentally clip-leaded one side of the filament (I had intended it to be the xfmr ct) to ground, while running some tests. Half the filament voltage, in my case 5.75 volts, appeared directly across the DC millammeter terminals. It didn't actually burn out the coil in the meter before I realised the mistake and disconnected it, but by then it had literally shaken apart the movement. Don K4KYV ______________________________________________________________ AMRadio mailing list Home: http://mailman.qth.net/mailman/listinfo/amradio Help: http://mailman.qth.net/mmfaq.html Post: mailto:[email protected]
