J
John Larkin
- Jan 1, 1970
- 0
John said:
John Larkin said:
Rich said:Is this an "I can't believe nobody else has thought of that yet"
moment?
I think if you hold in the button, the negative feed back will bias
the mosfet half-on (destroying it if load is too heavy).
A sort of oscillator?
VLV
Fry when it eventually drifts into the linear region?
Best regards,
Spehro Pefhany
No, but if someone holds the button long enough it'll be a "Phsssst -
pop - crackle - KABLOUIE" moment.
Why would it oscillate? No, it's a push-push on/off switch.
Not according to LTSPICE:
My sincere apologies to LTSPICE, but it does work.
Try, say, 1M and 0.47 uF.
John
Yep, It will work for optimal button-press times. Then it will leak
one way or 'nother ;-)
It's fun that it works, but otherwise useless.
...Jim Thompson
My sincere apologies to LTSPICE, but it does work.
Try, say, 1M and 0.47 uF.
Does everything that's fun have to be useful?
John
What? And what does it do ?
...Jim Thompson
My sincere apologies to LTSPICE, but it does work.
Try, say, 1M and 0.47 uF.
Your sketch, for the permanent record,
,---/\/\----+----o LOAD o-- +V
| |
| |--'
| ___ ||<-,
+--o o--||--+
_|_ |
--- gnd
|
gnd
A 0.5-s time constant. Should work with most
modest pushbutton presses. My experiments show
modern power MOSFETs can hold their gate voltage
for days, if not weeks. But surely you remember
out long-running thread that completed the simple
circuit with a 2nd transistor making a flip flop.