Joule Ringer!

[conradelektro]

Scope shots over 10 Ohm shunt, collector-emitter and lamp of xee2 type circuit.

@ Stefan (hartiberlin) and all interested parties:

The circuit and the spots where I connected the scope.

Greetings, Conrad

[hartiberlin]

Many thanks conradelektro  !

But you measured it at the power supply.

I just wanted to see it at the selfrunning state,
where it only runs from the capacitor.

But I already see from these spikes,
that the capacitor gets a recharge from the spikes also.

I will post a modified measurement circuit and please measure it like this.
Many thanks again for your great help.

Regards, Stefan.

[hartiberlin]

Please Conradelektro,
can you please try it this way ?

We also have to see the cap voltage.
Please set the scope to DC inputs and good
amplification to see millivolts changes in the cap voltage when the
spikes occurr.
Many thanks.

Regards, Stefan.

[conradelektro]

Scope shots over 10 Ohm shunt, collector-emitter and lamp of xee2 type circuit.

@ Stefan (hartiberlin) and all interested parties:

I will do the scope shot with cap only (no power supply). Here a scope shot that shows in more detail the very short transistor on time.

Conrad

[hartiberlin]

Many thanks Conrad,
now we really need to see the cap voltage in the selfrunning mode.

Many thanks in advance.

Seems this about 160 Hz pulses on the Fl tube
looks like it is always ON, but the human eye does
not see, that is is only very shortly on, so the
cap energy holds very long time...