Here are two versions of oscillator used for model engine CDI ignitions. The similarities seem obvious.
1) Is there any reason to prefer one version over the other? I am looking for comments about factors such as efficiency, reliability, component stress, etc. that would be difficult to evaluate at home.
2) Is the diode required? Both versions will operate without it for periods up to 5 minutes. I have not tested for longer periods or under field conditons. Is there a preferred diode type for that purpose, such as Schottky?
Thanks. John