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Old 27th Apr 2020, 5:47 pm   #38
FERNSEH
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Join Date: Mar 2005
Location: Gateshead, Tyne and Wear, UK.
Posts: 7,444
Default Re: The Ever-Ready experimental transistor TV set.

According to the article in the December 1964 Practical Television magazine 40 hours of use is possible from the TV1 battery.

"Reduction of the power demand to about 3 watts made possible the use of batteries from Leclanche cells of a new construction giving about 40 hours use, at two hour daily periods. The prototype Mark 5 is a 405-line receiver, and the extra circuitry required for dual-standard operation will increase consumption to 3.3 watts."

The power supply operates by producing an oscillation with a duty cycle of 2mS. The mark-space ratio varies according to battery voltage and current demand.

The Ferguson sourced signals panel is still giving problems. Sync pulse crushing at moderate contrast control settings. The 'scope shows that the video developed across the vision detector load resistor has the sync crushing condition. The first IF amplifier transistor will be checked first, good chance the AF114 has the tin whiskers fault.

DFWB.
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