Casio fx-61F Electronic Formula 27 Calculator

My old trusty Casio fx-61F “Electric formula 27” calculator is still going strong and gets regular use. It was bought in a sale from Maplin Electronics UK, some time in the 90s from a bargain bin as I recall. Why is it so special? Its a calculator specifically designed for electrical and electronic engineering. I don’t know Read more about Casio fx-61F Electronic Formula 27 Calculator[…]

Digital multimeter calibration for voltage, resistance and current

I got a little carried away with this one! I have an old multi-meter whose calibration was unknown. Surely an accurate voltage reference would help with that. After spending somewhere around £80.00 designing and building a calibrator for my cheapo old multi-meter i feel I’ve given this project more than it needed:-)     There Read more about Digital multimeter calibration for voltage, resistance and current[…]