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This is a mod that allows you to effectively use an electronic flash with cameras built before the 1970s. However, before I get into why this mod work...
You will need: - Electronic flash (with PC jack) - Arduino - ATtiny85 - 220 ohm 1/4 watt resistor - 10K ohm 1/4 watt resistor - 100K trim pot - MOC30...
Remove the batteries if you have not done so already. Open up the flash by removing all of the screws and carefully prying the case apart. Note that...
Press the 'flash test' button to trigger the flash and get rid of the bulk of the charge. Keep in mind that even though the flash went off, there can...
Desolder the 3/32" jack from the circuit board. Solder a red and black wire to each of the terminal pins. Notice that my jack had an extra thin blac...
Trim the perf board to be small enough to fit inside the flash casing and just large enough to hold the entirety of the circuitry. I used a guillotin...
Program the ATtiny85 as specified in this instructable. Program the chip using this code: /* Camera Flash M-Sync Mod This example code is in t...
Build the circuit as specified in the schematic. Do not go solely by these pictures because I made some of the critical bus (power/ground) connection...
Install the new 3/32" jack in the spot where the previous one used to be. Widen the mounting hole with a drill if necessary.
Connect one of the terminals on the jack to pin 6 on the Arduino. Connect the other terminal to +3.3V on the board (or whatever other voltage you are...
Connect the red wire that you soldered to the flash terminal to pin 6. Connect the black wire to pin 4.
Connect the ground terminal from the battery connector to the ground on the circuit board. Find the power switch for the flash. Connect the switch's...
Drill a 1/4" hole in the case directly over where the trim pot will be located. This will allow you to fine tune the timing with a screwdriver without...
Put the case back together. Make certain the hole lines up with the trimpot before you screw it shut. If it does not line up, install a little bit of...
M-Sync can be found roughly a little past twelve o'clock on the trimpot's dial. Adjust to suit your needs and tastes.
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