Rec-IgnitionAssembly

The are two different variants of Rec-Ignition. One is for digital inputs like points or Dyna hall effect inputs. The are characterized by the inputs being pulled to ground and then released for the spark. The 2nd is for analogue type inputs - pickup coils or reluctors. The same circuit board is used for each but each is populated with components differently

The RecIgnition PCB layout Digiplex version is the same as the analog with changes noted in table.
ComponentDigital InputsAnalog InputsDigiplexAnalog Inputs MkII
R1, R2Link3k9R2 not used3k9
C1, C2Link1uFC2 not usedLink
C3, C5N/A0.01uFC3 not used0.01uF
C60.1uF0.1uF0.1uF0.1uF
C710uF10uF10uF10uF
C8NA0.1uF0.1uF0.1uF
R3, R447k6k8R3 not used1uF
R5, R610k10k10k10k
R7, R83k93k93k93k9
R910k10k10k10k
X1, X2NAIN914 upX1 not usedIN914 up and down
X3, X41k5IN914 upX3 not usedNA
X5, X6IN914 up47kX5 not used18k
X7, X8IN914 dn47kX7 not used47k
T1, T2BC547BC547BC547BC547
Q1, Q2PHP6N60EPHP6N60EPHP6N60EPHP6N60E
U17805780578057805
U2Attiny26Attiny26Attiny26Attiny26

Click on the image below for an enlarged image
Analog MkII view

Assembly Steps

You may choose to solder the wires directly onto the circuit board rather than use the supplied terminals.

  1. Assemble and test the power supply
  2. Assemble and test the input conditioning
  3. Assemble and test the coil drivers
  4. Final assembly and testing

1. Assemble and test the power supply

Solder the IC socket and the 3 connectors at top.
Solder the components U1(the voltage regulator), C6, and C7 .Carefully noting polarity.
Apply a supply voltage between the +12V terminal and Gnd terminal. A 9V battery will work fine.Verify that 5V appears on the 5V terminal.

2. Assemble and test the input conditioning

Solder components R1, R2, C1, C2, X1, X2, X3, X4, R3, R4, and the other terminal blocks. Depending on which Rec-Ignition module you are building, some of these components may be links or not used.

Apply supply voltage again.
For digital inputs verify 5V appears on pins 11 and 20 of U2 and on the 2 inputs on the terminal blocks.
For MkI analogue inputs verify 2.5V appears on pins 11 and 20 of U2. No voltage should appear on the 2 inputs on the terminal blocks.
For MkII analogue inputs verify 1.4V appears on pins 11 and 20 of U2. No voltage should appear on the 2 inputs on the terminal blocks.

3. Assemble and test the coil drivers

Solder the components R5, R6, R7, R8, T1 and T2.Then solder Q1 and Q2. Don't forget their heatsinks.
A dummy load like a 12V torch bulb will make the next steps easier. Connect the bulb from the output terminal to the +12V terminal. This is just like your coils on your bike. Apply supply voltage again.
0V should be present of the gates of the FETs ( leftmost pin on the diagram ).The bulb should be unlit. If you short pin 9 of U2 to ground you should see the gate of Q2 rise to the supply voltage. The bulb should light. Repeat this for pin 8 of U2 and Q1.

4. Final assembly and testing

Install the remaining components and U2. A 0.1uF cap is solder under the chip (underside) between pins 5 and 16.
Apply supply voltage again.
With the digital input version, you should be able to short the inputs to ground and see the corresponding output energised.
With the MkI analogue version, you should see 3.0V on C8/R9.
With the MkII analogue version, you should see 1.6V on C8/R9.