Inverter 555 one transistor variable

588

13:36:11

Make DC to AC with ne555 as timer control and one transistor as potential control

published 5 years ago

fatcat2

5 years ago

Although you get 11.1 V something, the actual output is in the supply voltage range. You're relying on inductive kickback to do the job of stepping up the voltage but that's too bad as because of the distorted output and low drive capability. Also, you'd need a huge bulky transformer to do your job.

Robert_Kidd

5 years ago

Ignoring any other problems, your transistor will die from back emf. Protect it!

fatcat2

5 years ago

The transistor will probably be fine as the "reverse current" isn't that much and coz most BJTs can handle much more back EMF than ~13V

Robert_Kidd

5 years ago

It’s good practice to prevent back emf. Have you calculated theoretical back emf?

fatcat2

5 years ago

Nope; I refer to component datasheets. It says that for a typical small-signal BJT, it's around 35V.

Robert_Kidd

5 years ago

That’s what the transistor can withstand. It’s not what the circuit will generate.

fatcat2

5 years ago

Fine

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