Published:2009/6/30 2:07:00 Author:May | From:SeekIC
Developed for use as one of supplies for portable CR0, operating from battery using sealed rechargeable cells supplying 12 V at 2-5 Ah. High-efficiency inverter uses two GE D40C6 or RCA 2N5294 transistors (D101 and D102) as commutating switches for untapped feedback winding of power transformer. R102 then determines drive, while R101 produces required unbalanced starting bias. Thermistor R108 in series with CRT filament has cold resistance of 10 ohms to counteract very low cold resistance of CRT filament at start-up and prevent inverter malfunction. Article gives instructions for winding T101, along with high-voltage supply circuit and all other circuits of CRO covering DC to 10 MHz.—G. E. Friton, Eyes for Your Shack, 73 Magazine, Nov./Dee. 1975, p 74-76, 78-88 and 90-94.
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