DIY-CDI Success Stories:
Home made, SC layout
The unit working fine til now after I changed the TR3 from BC337 to BC107.
With TR3 = BC377 the unit some time won't produce fire when I start my
I think it because the BC337 I got in my country is the false one.
CDI prototype (Aluminium case) in glove compartment click .
CDI opened click .
The black painted cover one is the last condition or my multisparkCDI
RP (VW Golf, model 1988): I 4cyl, 1.8l, 70kW, water cooled, OEM carburator,
OEM distributor, OEM single coil (TCI)
Pickup: Hall sensor
It was easy to solder the parts.
At the beginning the CDI disn't work properly --> replaced TR3 (see
No difference between OEM ignition and DIY-CDI
Advanced prototype status
New layout, prossional equipment --> 2 layer PCB
Mario replaced the parts for oscillating circuit by a µC (ATMEGA8-16PU),
also for enabling and disabling the multispark feature, he.used a common 50/60Hz
2x6V/230V transformator VC 16/2/6, a too 'sensitive' 12-->15V voltage converter
SIM1-1215-SIL4, many other components, he minimized layout. The µC should
provide ignition advance (maybe a map) later and also provide toothwheel detection/triggering.
Current prototype is triggered by square wave. +12V pull up resistor, switched
by ground/rising flank like OEM ignition coils by traditional Kettering ignition
Jumper to switch beteen 300 and 375V, capacitor 9,1MOhm discharge rsistor.
Early stage click
Early single layer release click
Screenshot of Layout click .
In the CDI prototype factory click .
Nearly completed PCB (top, bottom) click
Test on kitchen table click
Capacitor discharge curve click .
Any 1, 2, 4 cylinder (also wasted spark --> 2 trigger inputs + 2 coil
outputs). Tested with PSA (Peugeot/Citroen) TU engines, near future: Citroen
Pickup: Hall sensor or 5V square wave by ignition controller (OEM ECU).
I couldn't run the CDI in my TU3M(KDY) engine easily because OEM BOSCH Monojetrinic
A2.2 ECU reqires one(!) ignition event as trigger. The CDI gives multispark
at starting/cranking --> ECU ignores or rev limiter count in --> parallel
dummy OEM ignition was required to trigger the EFI ECU only.
When I tried the CDI in Visa Club engine (flat twin) I made a mistake
and fried a component. Have had not the time and tools to find out. Should
be done the next days...
Any error/mistake? Please report quickly at ami8ATgmx.net AT=@
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