Various Eagle approximations of boards sold by Douglas Electronics.
- 5-de-7 is a drawing of the 5-de-7.
- 10-de-77 is a drawing of the 10-de-77.
- 11-de-7 is a drawing of the 11-de-7.
- 18-de-77 is a drawing of the 18-de-77.
- 21-de-7 is a drawing of the 21-de-7.
- 21-de-77 is a drawing of the 21-de-77.
- 9-de-8 is a drawing of the 9-de-8.
- 26-de-8 is a drawing of the 26-de-8.
- 104-de-8 is a drawing of the 104-de-8.
- 26-de-8x is a drawing of the 26-de-8 done with more mordern components.