A replacement using a 14M2 for a 19-year-old discrete IC wire-wrap board
Op Amp with differential inputs and both fixed and external custom feedback.
A homemade computer made from scratch from a now-obsolete chip.
John’s contributions to the SNOTEL Master Station
This Is a self-contained unit for testing transistors.
A thermostatically-controlled Exhaust Fan.
A remote control for the garage door
This is a battery-powered microwave motion sensor using doppler radar technology. It has its own indicators and relay plus control and information 433 MHz transmissions.
Generated two throws on a LED Matrix for each press of one side.
A LED strip activated by radar used as a nightlight
A 10 cps mechanical counter with a choice of voltage or contact-closure input.
This is the wooden Art-Deco cabinet of a 1941 GE model LCP-609 AM tube radio, with entirely modern electronics inside
This is a window fan which switches on when it gets cooler outside