WTB: genuine Toshiba 2SC5200/2SA1943, 4 pairs

[theAnonymous1]

Are they? I thought commonly smaller dies are used (cheap small power bjt in high power bjt case) and not short circuit.

A shorted bjt will not stay unnoticed in an amp.

Have fun, Hannes

Actually that's the only part of the translation I'm unsure of. It could be something else; I don't speak spanish. 😱

???suelen ponerse en corto al conectarlos???

"commonly short-circuit when connected" ??????

 

[Zero Cool]

Roughly translated it says/means:

The Bulb must remain off and only light when the switch is pressed. fake transistors will usually short out when connected to this circuit and power is applied causing the bulb to light without pressing the switch.

 

[AndrewT]

Now that we know what the circuit is supposed to do.
Do NOT build it as shown.
The bulb is a variable resistor between mains 120Vac and the test circuit.
All the components including the transistor and it's collector heatsink interface are connected to mains voltage.

This circuit MUST USE AN ISOLATING TRANSFORMER.
Either 110/120Vac : 120Vac or 220/240Vac : 120Vac

 

[okkyn]

Helo,

What is so special about this BJT pair? A lot of people like them. They are more expensive than MJLs... 😕

 

[jean-paul]

Now that we know what the circuit is supposed to do.
Do NOT build it as shown.
The bulb is a variable resistor between mains 120Vac and the test circuit.
All the components including the transistor and it's collector heatsink interface are connected to mains voltage.

This circuit MUST USE AN ISOLATING TRANSFORMER.
Either 110/120Vac : 120Vac or 220/240Vac : 120Vac

An isolation transformer can be used but it can do without when certain things are considered.

This circuit needs to be built safely i.e. all connections protected from accidentally touching them and it desperately needs a mains fuse in series with the bulb ! In its current form I would not recommend it to anyone ( unless that person likes to live dangerously ).