Stephan

scope is working, im cropping and anotating photos now  i left the battery on it
few more mins  one done 3 to go...

Spark

Hi Stephan.

Here are the shots of the R1 resister and the R2 light bulb
working on other fet point shots next....

Spark

Hi Gyula,

The cold resistance of the bulb is 1.5 - 1.6 ohms.

Spark

Hi Igor, Gyula,

Sorry some of these shots are upside down.
BUT it was easyer to clip the gnd aligator to the drain and poke around with probe.

Still on battery so no ground loops same for all shots today.

battery now 9.88v on dvm filiment still hot, but not as bright as last night of course.

The new larger caps will not discharge like the current bunch, that was visable on the scope/relay version of this circuit

Q4 FET scope shots:

Spark

Hi people,

I added the blocking diode and now i can tune the monovibrator.

New test;

Mains driven 10dcv power supply,
R1=10ohms 1/4w,
R2=10ohms 1/4w,
multimeter

whole circuit input  (no r1, draws 12ma@10v)
9.93V
72.4mA
0.072W

across R2  (0vdc must use acmode.  I know...)
1.95V across R2
0.2A   in series with R2
0.39w

multimeter COP 53 to 1

Finger test you can touch R1 to your lip,it is warm, I canT feel it with my fingers.
R2 will burn your finger! again the burning resister effect like with relay.
(disclaimer: Touching R2 to your lip will result in serious burn and personal injury)
Is R2 53 times as hot as R1??? probably not, BUT its more than 3 times as hot!
way more IMHO!

Spark