Blog

Welcome to the BSG Electronics technical blog. These pages include build guides, assembly instructions, and reference notes for electronics, pinball, and arcade projects.

Owner / Designer: Charlie Pyne

Sep 28, 2026
Boston MBTA Live Subway Tracker with ESP32
Boston MBTA Live Subway Tracker with ESP32
Sep 27, 2026
New System 80 / 80A Power Supply for Gottlieb Pinball Machines
New System 80 / 80A Power Supply for Gottlieb Pinball Machines
Sep 11, 2026
Gottlieb Pop Bumper Driver Board
Aug 31, 2026
4164 and 41256 Memory Tester Assembly Instructions
How it works
Jun 11, 2026
Chicken Coop Motor Drive
Motor reversing door controller board for use in chicken coops
May 31, 2025
A Manual Programmer for 82s129, 82s126, 74s287, and 74s387 PROM Chips
Program vintage PROM chips without an expensive programmer
Apr 15, 2025
Binary Clock Kit - Build Instructions
Tell time in Binary
Dec 26, 2024
6116 RAM Memory Tester
How it works
Apr 7, 2024
Williams Stereo Adapter for Stargate, Joust, and Sinistar
Dec 31, 2023
A Manual Programmer for 82s123, 82s23, 74s288, and 74s188 PROM Chips
Introduction
Mar 5, 2023
4116 Memory Tester Video And Assembly Instructions
How it works
Aug 18, 2022
Needhams Programmer Software
Needhams EMP Software Links
Apr 26, 2022
Needhams Emp 30 Device List
Needham’s EMP-30 Device List
Apr 16, 2022
PROM Substitution Reference
PROM Substitution Reference
Apr 16, 2022
Needhams Emp 20 Devices
Needham’s EMP-20 Device List
Apr 15, 2022
Signetics Bipolar Memory Cross Reference
Signetics Bipolar Memory Cross Reference
Mar 11, 2022
2114 and 9114 Memory Tester Video and Assembly Instructions
How it works