[Hammarlund] Zener-diode ballast tube replacement.

[MICHAEL TALLENT]

You should be able to full-wave rectify the 6.3 and get around 8 volts DC 
with a large enough filter cap and then use a "low dropout" regulator IC and 
set the voltage closer to 6 volts.  Best to look with a scope on the filter 
cap under full load and low line voltage to make sure you have enough 
voltage to stay in regulation in the IC.

Mike  W6MXV

-----Original Message----- 
From: D C _Mac_ Macdonald
Sent: Sunday, July 07, 2013 3:56 PM
To: WA5UEK Brian Harris ; Hammarlund Mail List
Subject: Re: [Hammarlund] Zener-diode ballast tube replacement.

Since this all got started to hopefully stabilize oscillators, I wonder if 
those who don't have a 12-14V AC source in their receivers could take the 
6.3V AC (hopefully) and stabilize the oscillator filament at say 5.25 to 5.5 
VDC with careful selection of the zeners.


* * * * * * * * * * *
* 73 - Mac, K2GKK/5 *
* (Since 30 Nov 53) *
* k2gkk at hotmail.com *
* Oklahoma City, OK *
* USAF & FAA (Ret.) *
* * * * * * * * * * *



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