Ignition box retard with RPM
a "high speed" transistor (1) has a turn on/hold/turn off time of 2.1u seconds or 2.1 microseconds (millionths of a second) so that should easily handle .000027xx per degree (that would be 27 microseconds) as it could theoretically do a complete off/on/off cycle in 1/10 of a degree at 6000 RPM, stack a few in series and then your slew rate is adding up . Honda motorcycles were doing 22000 RPMs using some sort of ignition back in 66 and 20K up to today.
This is probably close (minus LED status indicators) to an old Chrysler ECU coil driver schematic as it even notes a heatsink required for T2 (the T0-2 you see on top and ECU with the heat sink under it) S1 is a point breaker but could be triggered by a Hall effect or mag pickup with supporting components.
a "high speed" transistor (1) has a turn on/hold/turn off time of 2.1u seconds or 2.1 microseconds (millionths of a second) so that should easily handle .000027xx per degree (that would be 27 microseconds) as it could theoretically do a complete off/on/off cycle in 1/10 of a degree at 6000 RPM, stack a few in series and then your slew rate is adding up . Honda motorcycles were doing 22000 RPMs using some sort of ignition back in 66 and 20K up to today.
This is probably close (minus LED status indicators) to an old Chrysler ECU coil driver schematic as it even notes a heatsink required for T2 (the T0-2 you see on top and ECU with the heat sink under it) S1 is a point breaker but could be triggered by a Hall effect or mag pickup with supporting components.
