Re: How to make a relay slow release ?
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<Slow delay also equals slow pickup unless you add another relay contact.?
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<Don W4DNR?
##? I? had? thought? of? that scenario.? A? 25,000 uf cap,? charged? up to? 12 vdc? =? 1.8? joules? (1.8? watts? for? 1? second).?
12 VDC vacuum? relay,? with a 500? ohm? coil? =? .288? watts.?
?1.8 / .288 =? ?6.25? seconds slower? release time.
##? I? will? measure? both? the? 'pickup'..and also...'dropout' vdc? of? the vac? relay.? ?I? suspect? both? will? be? far? less? than? 12? vdc.
##? On? paper,? the? 25,000 uf? cap? should? charge up very? fast,? almost? instantaneously.??
##? Relay? in? question? is? the? kilovac? DPST-NO,? sold? by Ameritron /? MFJ.? ? PN 408-8100, $19.95? ?(page? 76? in? 2020? online? catalog).?
5? kv? @? 10A? contacts. (5A? RF). So? will? parallel? the? contacts..and? turn? it? into a hd? SPST? 20A? CCS? rated fast? vac? relay. Those? relays? are? cheap? from? ameritron.?I'm? gonna? use? one to? shunt? out? the? 50? k? resistor in? the? CT? of? fil? xfr.... on? TX.?
Jim? VE7RF
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