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Electronics

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 [...]
Ticket To My Heart – Admit One
With Valentine’s Day approaching I thought I would share this design for a custom gift which I made. It’s a Printed Circuit Board (PCB) in the [...]
Infra-red remote control tester
Is the TV broken, has the TV software stopped responding or is it just that the remote controls batteries have gone flat again? This little paper circuit [...]
BLE serial hub to WiFi and Blynk visualisation app
So that I can continuously post environmental data to the Blynk cloud service from my Bluetooth environmental monitor, I’ve implemented a simple [...]
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 [...]
Indifference amplifier
Love transcends all. But love can be transformed into hate so easily if we allow ourselves to become indifferent to the problems hate causes.
LED lamp dimmer with a 555 timer and comparator
I wanted a simple bedside lamp with a continuously variable brightness. Something I could read from whilst also being able to dim the lamp in an analogue [...]
Environmental Monitor Node Using HM-10 Bluetooth LE
Knowing the babies room temperature has become a bit of an obsession. When the temperature changes you need to make sure baby doesn’t wake up due to [...]