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Note: Originally posted in November 2013. This post refers to the Nest thermostat Generation 1, which has been deprecated by Google. That said, the information regarding wiring connections still applies. Nest thermostat battery charging problem and solution My Nest (Generation 1) had been working flawlessly for several months, both summer and winter (heating and cooling)…
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The HP 3245A Universal Source is a versatile precision instrument that combines DC and AC signal generation, offering both high-resolution DC outputs and synthesized AC waveforms up to 1 MHz. Function Details DC Outputs 24-bit resolution, 60 ppm accuracy, voltage & current modes AC Outputs Sine, square, triangle, ramp, pulse up to 1 MHz (100…
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Firmware Gigapan Epic Pro Firmware Update Problems and Solution (Updated November, 2025) Gigapan has a firmware update available for the GigaPan Epic Pro, here: GigaPan Epic Pro Firmware Update To find out if you need it, check the firmware on your Epic Pro thus: Select “Options” – “Expert Options” – “Firmware Version” The current firmware version…
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Originally posted in December, 2018 Tektronix 556 Dual Beam Oscilloscope Images What follows is a series of images of my Tektronix 556 Dual Beam Oscilloscope displaying various waveforms. I am learning about this scope and how to use it. A brief description of the unit can be found here: Tektronix 556
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Originally posted in February, 2017 Numitrons are low voltage incandescent display devices perfected and marketed by RCA (see RCA advert above) in the early 1970’s. I would call this a bridge technology as the display is incandescent, but can be driven by integrated circuits. They were quickly displaced by solid state LED (light emitting diode)…
Shaun Merrigan
Classic Electronic Restoration, Vacuum Tube Audio, Technical History, Photography