Been working with a 1090 all caboom due to electric failure in the client's home
Noticed the Vbe multiplier transistor is a darligton (https://pdf1.alldatasheet.com/datasheet-pdf/view/39180/SANYO/2SD1953.html)
recall that i ve seen once more i think in a Marantz amplifier ....
So i wonder why
a BC547 could do the same job a Bd 139 also 2sd600 that was available in stock
Am i missing something here ?
Noticed the Vbe multiplier transistor is a darligton (https://pdf1.alldatasheet.com/datasheet-pdf/view/39180/SANYO/2SD1953.html)
recall that i ve seen once more i think in a Marantz amplifier ....
So i wonder why
a BC547 could do the same job a Bd 139 also 2sd600 that was available in stock
Am i missing something here ?
Maybe its just a cheap device that is suitable to mount to the heatsink. A Darlington multiplied by 2 is going to work like a single BJT multiplied by 4 really. The resistor values have to change if switching BJT<->Darlington
may be is not a valid expression in electronics
In large scale productions logistics play siginicant role also
In large scale productions logistics play siginicant role also