one switch of ON/OFF, the other is the bulb BYPASS.
Is the bulb off when there is no load and the ON switch is held down?
Does the bulb react in any way when you connect a load and hold the ON switch down?
Can you arrange a big load to light the bulb? and does it o off when you press the BYPASS?
Is the bulb off when there is no load and the ON switch is held down?
Does the bulb react in any way when you connect a load and hold the ON switch down?
Can you arrange a big load to light the bulb? and does it o off when you press the BYPASS?
Sounds to me like you have a short connecting the input supply to the output! Double check you have not left any tracks linking parts of the circuit where they are not meant to.
Hi Richard,
Congratulations on having the same problem on both rails😉 😕
I'm with Nick on the uncut tracks.
I bet your sick of looking at it
Congratulations on having the same problem on both rails😉 😕
I'm with Nick on the uncut tracks.
I bet your sick of looking at it
hello.
picture post 181 looks like there is a res solderd to the screw.....isn't the screw a collector pin? perhaps you connected the collector with the emitter by a res (100 ohm?).......
perhaps it can help............
greetings............
picture post 181 looks like there is a res solderd to the screw.....isn't the screw a collector pin? perhaps you connected the collector with the emitter by a res (100 ohm?).......
perhaps it can help............
greetings............
AndrewT said:
Hi Andrew
When I connect the light bulb and press the on button the light, lights up for a second and then goes out. This happens when I have a 230R resistor between V- and ground
I will check the other combinations tonight and will also increase the value of the test resistor
Richard
AndrewT said:
I am using a 40w bulb for this test
Q1> Is the bulb off when there is no load and the ON switch is held down?
A1> The bulb lights for less than a second
Q2> Does the bulb react in any way when you connect a load and hold the ON switch down?
A2> As above
Q3> Can you arrange a big load to light the bulb? and does it o off when you press the BYPASS?
A3> I placed a 1K3 resistor between V- and Ground, the bulb lights as above and the bypass switch has no effect.
Remember I get 27v from the Zener and 34v from the first BD140 (-v)
So I am guessing the problem is between these two points.
I haven't had much time on it tonight because the wife wanted me to watch 'Mistresses'...such a shame 😉
So I am guessing the problem is between these two points.
I haven't had much time on it tonight because the wife wanted me to watch 'Mistresses'...such a shame 😉
Tidy on top...messy on bottom!
This picture was taken before I added the link to the collector pin of the BD912, I have only added it to the -v side for the time being.
There is a blob of solder on the -v side where the zener and the J309 meet....I carelessly soldered the J309 one row too high and then had to bridge the connection.
I'm off to hit the hay!
This picture was taken before I added the link to the collector pin of the BD912, I have only added it to the -v side for the time being.
There is a blob of solder on the -v side where the zener and the J309 meet....I carelessly soldered the J309 one row too high and then had to bridge the connection.
I'm off to hit the hay!
audio1st said:
Thanks Barry
I will check again this evening.
I have added a link after the BD912, between the collector pin and v-
This was added just before this photo was taken
Tripmaster said:
this is not right.
The bulb must be off when both switches are off.
The bulb must not flash, not even briefly nor dimly, when the ON switch is pressed and there is no load.
The bulb must go out, if it is already glowing or lit, when the bypass switch is pressed.
A big load would be a kettle, fan heater, iron, toaster etc.