Audio Visual User Interface with Ack
This circuit is an User Interface part of a Security Alertness Monitor that i designed decades ago. The circuits are here – Digital Circuits – Part 1 The RAM and RTC part is missing, i will add later....
Category: LED-Circuits
InfraRed Detector for Proximity Switch
The proximity switch can work for a wide range of power, from 8v to 18v DC, D3 protects reverse power supply connections, and U1 regulates the supply to +5v , -5v is derived from...
Battery Brightness and a Blinking LED
Many many thanks for this quick reply again. We are also experimenting with stobing the LEDs very fast using digital out of the MCU’s I/O to kind of PWM the LED to calibrate it...
The Return of Bright LED
From my Thunderbird archives. it may be interesting to read, maybe you may learn a thing or two. Many thanks for your quick reply – much appreciated. The FET solution is new to me,...
Driving a LED from MCU
I just read your blog and found it very helpful – thank you. I am working on a new toy project and have a problem I think you can help with. I am turning...
Perpetual Candle – White LED Lamp on Ni-Cd
This is a easy to build LED lamp circuit for Learning and building skills. This is the first draft schematic V 1.0. It will need improvements for Higher Power Lighting. I will give a...
Mains Voltage monitor using LM3914
This Circuit helps in the monitoring of mains supply voltage. It does not use a isolation step down transformer. This has to be constructed only by skilled people with knowledge of safety requirements. C1...
Constant Current Source LED Drive
This is a Constant Current Source LED Driver, When the LED driver Upper-NPN is driven by a voltage thru 4.7K the LED lights up. Assume that the Lower-NPN at bottom is absent. The current...
