LED Lamp – Simple Bed-Lamp Circuit
2022-04-01
LED Night lamp, Clock Lamp to see time at night. It is a Green Lamp just 50mA, but its Blue in Color.Read More
LED Lamp or Bulb with Flashlight option
2020-08-24
This is another LED lamp from China, these people make nice lamps and also good designs of the plastic enclosure. Here by a clever enclosure design it is both aRead More
Convert Analog to Digital with a V-F
2019-04-10
A Low cost A/D with a Potential of 5KV Isolation from Computing elements by use of Normal/Special Opto-Couplers. This can give better resolution and accuracy than a 8 bit A/D.Read More
Powered USB Hub Help PC Interface
2016-03-14
I got a strange problem as i added more and more peripherals, the pc gave odd messages, “i cannot detect what you are doing” and things like that. I almostRead More
Charger for Portable Devices
2016-03-14
This is a simple charger you can build for devices. It can be modified for any device. This may need no modification for devices that are charged using PC USBRead More
Mains Powered China Emergency Bulb
2010-09-01
A typical Mains Powered China Lamp. On power down, LED light turns on for around 1/2 hr. Gets damaged on lightning activity and wide (uS not nS) transients above 300V.Read More
Torch or Flashlight Circuit Improvements
2010-08-09
I fixed a China Torch with New LEDs and a Diode, it failed probably on a drop shock, the battery wire cut … then when put on charge Few LEDsRead More
Mains Adapter 230V AC 50 Hz to Rectified DC
2010-08-08
Mains Adapter Converts 230V AC 50 Hz to Rectified DC which replaces a Battery Pack. It was also called Battery Eliminator by older generations as it was used to saveRead More