T
talisman
- Jan 1, 1970
- 0
I am building an electric fence using a 12 volt battery to energise
NE555 timer to drive a TIP41C transistor into a car ignition coil .
Coil resistance is 1.7 ohms as measured
Drive pulses to TIP41 are about 30ms duration at one pulse pe
second
Problem is that TIP41 gets hot enough to destroy itself after about 3
pulses
Difficult to measure current as spark upsets multimeter
Using a lamp as load I measure 1.6 amps and TIP41 still gets ho
enough to burn
What am I doing wrong !!
Should anyone volunteer to help me I can email the circuit which I go
from the net but with no contact address
NE555 timer to drive a TIP41C transistor into a car ignition coil .
Coil resistance is 1.7 ohms as measured
Drive pulses to TIP41 are about 30ms duration at one pulse pe
second
Problem is that TIP41 gets hot enough to destroy itself after about 3
pulses
Difficult to measure current as spark upsets multimeter
Using a lamp as load I measure 1.6 amps and TIP41 still gets ho
enough to burn
What am I doing wrong !!
Should anyone volunteer to help me I can email the circuit which I go
from the net but with no contact address