The 150K resistor will be to turn the transistor on and when the capacitor is charged the transistor turns off and the resistor will discharge it for the next cycle. No need to replace the transistor .

Looking at your mechanism, the leaf spring can be altered by the tension screw on the left or the lever on the right, increase tension will slow it down.

 

The 150K resistor will be to turn the transistor on and when the capacitor is charged the transistor turns off and the resistor will discharge it for the next cycle. No need to replace the transistor .

Looking at your mechanism, the leaf spring can be altered by the tension screw on the left or the lever on the right, increase tension will slow it down.

i found this on an article :

The diode is included to minimize the reverse voltage pulse when the transistor turns off. The resistor (R1) in series ensures that the coil provides as little additional impulse as possible. If one uses a diode without R1, the impulse may be extended by a few milliseconds - that may be enough to cause pendulum overswing. R1 may be increased slightly (up to about 330 ohms) if overswing is evident.

is this correct ? will adding these 2 make any issue to the existing circuit ? or drain the battery ? if not what is the suitable diode for this ?

 

But i need to know that what happen when diode and resister are added

Did you read post #12?

 

Is it better to replace C828 transistor with a BC549 ??

No. Why do you want to? It wouldn't affect the timing (which is mechanically determined).
It might be possible to synchronise the mechanical timing arrangement with a crystal-controlled oscillator circuit to improve the timing.

 

No. Why do you want to? It wouldn't affect the timing (which is mechanically determined).
It might be possible to synchronise the mechanical timing arrangement with a crystal-controlled oscillator circuit to improve the timing.

Thanks for the clear answer !!

i was worried because of this comment : "The diode is included to minimize the reverse voltage pulse when the transistor turns off. The resistor (R1) in series ensures that the coil provides as little additional impulse as possible. If one uses a diode without R1, the impulse may be extended by a few milliseconds - that may be enough to cause pendulum overswing. R1 may be increased slightly (up to about 330 ohms) if overswing is evident."

As it say , can overswing happen without these 2 ? coz it's run little fast now

 

Is it better to replace C828 transistor with a BC549 ??

Where that idea comes from?

 

As it say , can overswing happen without these 2 ? coz it's run little fast now

I doubt there's any overswing, with or without the diode and resistor. The transistor turn-off is not very abrupt, because of the way the coil current is controlled by a pick-up coil responding to oscillation of the flywheel. If the clock is fast, use the adjuster knob to slow it.

 

Where that idea comes from?

I took it from HERE