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Re: [TCML] Ever so slightly off topic. (NOTICE: Link may need editing)

I worked in a maquila in Cd. Juarez making TVs of several brands. The FB circuit in them had a capacitor on the primary side that tuned to the third harmonic of the output pulse. This had the effect of flat-topping the pulse, which gave better voltage regulation and helped to limit the spike on the xstr. I don't remember exactly how this was connected, but it can probably be found on the schematic of any old TV. 

---Carl





On 1/11/2016 8:47 AM, Reverend Fuzzy wrote:

I do have a problem with that circuit, a 1n4007 is a 1A diode.
Most ignition coils saturate at 5-10A, so either the on time is so
short as to limit the current to 1A (with reduced output) or the diode
is severely underrated.

I'm also having doubts about the diode's ratings.  I think perhaps something
like an MBR735 could fare better with it's rating of 7.5 amps.  At the
current price (no pun intended) of about 8 cents each from BG Micro, it
could be easily cost-effective to give it a try... if it fails, not out too
much $$$. :)
---
Reverend Christopher "Fuzzy" Mayeux
Pastor, MSB Ministries



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