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Alacsony feszültség esésű stabilizátor elektroncsövek fűtéséhez

Előfordul, hogy egyenfeszültségről kellene fűteni egy, vagy több csövet, de nem áll rendelkezésre elegendő AC feszültség egy szokásos 3 lábú stabilizátor számára. Tipikus, hogy csak 6.3V-os tekercse van a trafónak. Meg lehet próbálni integrált LDO-t használni, vagy akár az alábbi áramkört. Már szóba került itt.

IDH(TP) LDO

 

Túláram / rövidzár védelmet egy további tranzisztorral lehet megvalósítani

Túláram/Rövidzár védelem

R101 - áram érzékelő ellenállás 0.22 Ohm értéknél 3A körüli az áramkorlát ( Iz =~ 0.65 / R101 ) erősen függ Q2-től. R102 - a FET gerjedésgátló ellenállása, a védelem nélküli verzióba is kellhet, 300 Ohm - 1K R103 - Q2 bázis áramát korlátozza, 470 Ohm megfelelő ide Q2 - beavatkozó tranzisztor, gyakorlatilag minden kisjelű NPN tranzisztor megfelel

Az áramkört itt találtam.

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