LED Voltage Level Indicator
This circuit is derived from a Siemens Application Note 1974. This circuit uses common components of today. The circuit is here as it is of high educational value. I have not tested it. You...
Category: Discrete-Circuits
Constant Current Source for LED
This article will explain the way a simple transistor based current source is designed, this will give an idea on how some components can be used in a practical way to make the circuit...
Simple High speed data switch
This circuit is a small representation of a very low cost printer sharer. It has no Active Devices only diodes.
Mains Voltage Indicator with a LED
This is a mains 230V AC voltage indicator and is a LIVE CIRCUIT, so take care. The Resistor has to be a fusible ceramic wire wound and the capacitor 630V AC or higher capacity....
Isolated dual power supply from 5V
This is a unregulated supply for low power circuits. You may be able to regulate the outputs with zeners or small regulators like 78L05. The transformer can be hand wound in a mini ferrite...
RS232 with Opto-Isolation
I had to once interface an high voltage circuit to PC, The uC had to communicate thru RS232–Comm port–Serial Port. Part of the 80C31 8051 SBC Even though i had isolation at the sensors...
