View Single Post
Old 13th Oct 2021, 6:04 pm   #14
G6Tanuki
Dekatron
 
G6Tanuki's Avatar
 
Join Date: Apr 2012
Location: Wiltshire, UK.
Posts: 13,951
Default Re: 5FP7 project starting with the focusing coil.

The RSGB-manual SSTV monitor using a 5FP7 has this circuit to generatre HT for the tube, using a LOPT with the feed to the scan-coils removed.

The potentiometer varies the mark:space ratio of the oscillator and hence the HT.

These days I'd look to doing it using a 555 and a switching transistor scarfed from a SMPS.
Attached Thumbnails
Click image for larger version

Name:	eht.jpg
Views:	82
Size:	58.8 KB
ID:	243337  
__________________
I'm the Operator of my Pocket Calculator. -Kraftwerk.
G6Tanuki is offline