First off, we needed to get the manual for it. Fortunately, the Lincoln manual already had the pin-outs for its accessory connector, and Miller is very good about letting you download their old service manuals.
From the manuals, it appeared that the Spoolmatic needs a 35V DC power supply, a realy, and a simple RC circuit to provide a power-on delay for the motor. The Lincoln seems to just need triggering, which we can do with a second set of relay contacts.
The next problem was finding the right MIL-SPEC connectors. The one on the Miller was a 4-pin AMP, and I was able to locate this fairly quickly on Digikey, as most of these are type 97. FYI, the female pin part is:
AMP#97-3102A-18-4S
The 12-pin Lincoln connector was a little harder to track down, but I made a guess that it's also an AMP and found it as:
AMP#PT06A-14-12P(SR)
Next, I made a quick board layout in Eagle CAD and etched a board using Fab in a Box and a laser printer:
![](https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEiu1OlYpqAkaUfvBMCM-zXcHGUuvMb2jfOwnZ_i6X6RNv4MIgwm5cpKBvxrzytlw11i71isNRYTowFHM7x1dhwvm_6InT6dLGcB3Gb24R5D_FsB1SmbRjiAgitqAjyKjaKDSLqpfEV14mYN/s320/circuit3.jpg)
![](https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEhJresC75zxpX-h4VqJYs-PtcE4ZWZfLwNMQxwnvinJAG47wQrUNwJMv49v6f_fODlLFnNfaNBMDM2yRAcxRjLjAgJrwKNRpxsj_HHirb8bY5YtwQvMoyuAwxq0I91Uq6oalHOTwOH_tpmn/s320/circuit4.jpg)
![](https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEis2bKGE_DmQn9ELTSdNYw79Ob5JehhDDx2yogFAwz89k_xqZ1WonFEWJDARP_HVh0PaQ38VX3iKb17J2ghmMBHiA7WPj8-ivIqANiNAVOMkvc9TFhhxeN87KBvL2CJ2U5DoUv_Nd2Rw5L_/s320/circuit5.jpg)
![](https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEh_Hw9GFe2XxWENu_ZEyRn_ZlAZH2t_zbgfDdiAeDm_VlXrr8EUReeFDnErqysbM8MTSOgG56yq06S13gSPr_26ozeSwl80uOvjZQmyYjKdvtKajWFzgSTIh4c25eoG2XSSNE05wlt8Vhat/s320/circuit6.jpg)
And here it is stuffed:
![](https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEgrwmx-iEQfLvu_hhVO2yL8fBRFLSDSL_ze55rbwOOFown4-dmA-v-8hj-A6s5-bZTlOhdIFpiUDuRDsuPY2ULJ4VWJaCnITmwjbSz3FZR_hCD0mu9sTGQd55px4bXrxF0bymyEU0NRnZOe/s320/circuit7.jpg)
![](https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEipkSsWHt8EUbfl5SnZSjCOHHOXwC46XNmmyp5GL1fEtDAzPeWsJxRACFxoM8U5A6WSThVgFDlt1wvnJU5qY5gaLoHr5WlDiwDCclmDlLOJFDz5zWm1rtc2nVtwG65AkUjEHvz_78md5dGj/s320/circuit8.jpg)
So far, I've got it activating the welder and spool gun. The next step is to see why it isn't auto-sensing spool gun vs. MIG gun. But this isn't bad for one evening of progress.
Arclight
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