Digital to Analog Converter with uC Watchdog
This is the continuation of the earlier post. Part of 80C39 based Process Controller. In this schematic you can see the Watchdog and D/A Converter. 80C39 and MCS48 based Process Controller is the main...
Battery Backup Supply
This is a 9V power supply which will work even on power failure. It uses a rechargeable battery and regulators. A transformer with 15-0-15 AC volts output is required. From my Power Electronic Circuits...
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...
Mixed Signal Grounding Method
How do we interface Analog and Digital Blocks. The earlier post explains ground connections that are radiating from supply but does not show Analog and Digital Blocks Interface.
LM3914 Circuit Ground Connections
I am about to build the circuit that you have here: – Millivolt Meter – Bargraph I am pretty sure that I understand all of it, except for the symbols that you have at...
ICL7135 PCB Layout Method
I have design a PCB layout for a 4.5 digit voltmeter using the ICL7135 chip, and i have problems with the analog and digital ground. Do you know if somebody have make a PCB...
Non-Inverting Amplifier – Op-Amp Circuits
The input impedance of this module is very high, if U1 is OP07 it is in mega ohms, use CA3140 or LF356 fet input opamps to get 1 tera ohm input impedance, but for...
Dual Polarity Power Supply
This supply gives both positive and negative outputs. Appropriate Fuses should be used to protect from fire hazard and overload of transformer. Voltage Regulators LM7812 and LM317 You could use LM7824 or LM7815 or...
