Using a pop bumper driver board as a timer for motors and toys
The PBDB on-time is set by C3 (stock 4.7 mfd) and R2 (stock 12k), giving a short pulse. With R2 at 12k: C3 47 mfd gives about 1 second, 100 mfd about 1.5 seconds, 470 mfd about 5 seconds. R2 22k with 470 mfd gives about 7 seconds, and R2 56k with 100 mfd also about 7 seconds. This lets a spare board run a motor or toy for a set time.
Systems
Related tips
- How the System 80 pop bumper driver board works
- Bench check of a pop bumper driver board
- Common failures on the pop bumper driver board
- Mandatory pop bumper driver board update
- How the pop bumper driver board fires its coil
- Original pop bumper driver board values (A-19741)
- Under-playfield pop bumper driver boards protect the coils
- A pop bumper doesn't work at all
Source: Repairing & Upgrading Gottlieb System 80 Pinballs from 1980 to 1989, Part One, Clay Harrell (pinrepair.com)