K2543 ignition amplifier making a ticking noise

Kits Automotive projects
1

My old car had a pair of K2543 ignition amplifiers in the engine compartment. I had a failure once which I suspect could be due to heat in the engine compartment.

On my new car (well 36 years old but new to me) I have fitted a new pair of these ignition amplifiers but for a more reliable and stealth look I screwed the box to the side of the glovebox, so it is totally hidden behind the dashboard.

I have to have a pair of amplifiers because this V6 engine has two contact breakers and two coils, so it is like an independant pair of 3 cylinder engines.

The car runs very well but the K2543 ignition amplifiers are very noisy. At idle it sounds like a couple of cicadas in the car. When the car is driven and the revs increase they sound like demented cicadas.

Why do the K2543s make a noise? I tested to see if both circuits make a noise (by running them one at a time) and they do both make a noise.

2

some more questions

  1. how critical is the value of the 0.22uF capacitor which is across the output transistor?
  2. could I move that capacitor off of the PCB and put it near the coil instead?
  3. instead of the 0.22uF could I use the condensor that’s fitted to the car instead? I know that it can’t be connected to the input to the amplifier but I could easily connect to the output side to coil terminal instead. Then it would be in the same place in the circuit that the 0.22uF is.
3

I have the same problem, i can listen a little noise in the ks2543. What happen?

4
  1. Could I put the capacitor across the coil instead of the transistor?
    Across the transistor it is damping current from the coil through 0V, through the battery and to the +12V connection to the coil.
    Across the coil is damping current from the coil directly.
    I think in theory that the 12V DC offset of the battery (or lack of) should not make any difference as a DC offset is irrelevent to a capacitor anyway.
5

i need resolve my problem :cry:

6

Sorry, we do not have any experience with this behaviour.
Maybe other forum users?