How to increase the life of the kinescope. Encyclopedia of radio electronics and electrical engineering
Encyclopedia of radio electronics and electrical engineering / Телевидение
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Assembling a circuit for delaying the inclusion of a kinescope according to the article by A. Ilyin (RL 4-95), an option for the MTs3 block, I found that this device needs some improvements.
1. Zener diode VD1 in the circuit is used as a key element that opens with voltage, and its operating current here is much less than 3 mA - the minimum allowable according to technical conditions. In this mode, the opening threshold of the KS 156 zener diode turned out to be only about 2 V (at a current of 30 μA). Therefore, to increase the delay time and more efficient use of capacitance C1, it is better to install a second zener diode VD1 in series with VD1.1. Also, to increase their operating current, it is desirable to reduce R3 to 30 kOhm.
2. With a capacitance C1 of 220 uF, the device is ready to be switched on again no earlier than after 30 s, since the discharge occurs through R4 with high resistance. To speed up this process, R4 should be shunted with a VD2 diode. When charging, it is closed by a voltage from a +12 V source, and after turning off the TV, it opens with a potential from C1, and the discharge quickly occurs through the direct resistance of the diode.
3. Instead of C1 at 6,3 V, it is better to take a 25 V capacitor. Capacitors for a higher voltage are more stable, and most importantly, they “dry out” less over time.
All of the above is also applicable to the variant for the MTs2 unit, since they have the same node for forming the delay interval.
Author: A. Skorlupkin, Saratov; Publication: N. Bolshakov, rf.atnn.ru
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