Single Digit Voltmeter with LM311
I wanted to design a logic probe as a tutorial, but there were many good ones in the web so i have tried to design a single digit voltmeter. This circuit is a design,...
Category: Interface-Crcuits
Printer Port 256 Relays 16K Dot Matrix
Using this circuit on Printer Port, one could drive 256 Relays or 16K LEDs as Dot Matrix display. It can be used to drive a Large size multiplexed LED dot matrix display or Latched...
Simple Water operated relay
This was done in my early days, i have upgraded it, it ought to work, reduce the number of transistors to make it less sensitive, also a lower value in place of 10M will...
Digital Interface Part Two
Continuation of Digital Interface Discussion, only my part of the communication here. This will help you understand some common methods and issues.
Digital Interface Conclusion
Here i am listing the last few parts in this Interface discussion. Only Points to remember are listed. Resistors attenuate voltage or reduce. Current flow has to be limited. The adc may get damaged...
Digital Interface Third Part
Only my Messages are combined here to create paragraphs. Related to Interfacing an Embedded System to external circuits. Pull up means a resistor connected from a point to +V. Pull Down is Resistor connected...
Digital Interface Basics
After a long time a thread of discussion. It is about digital interfacing of embedded system. Only Education Points listed. Initials and country of origin also will not be mentioned henceforth. When this Circuits...
Relay Driver – Electromagnetic
This circuit is a standard way of driving Small Power Relays from Control Signals generated by Logic or Opamp Circuits. C2 and R5 form a snubber which improves the life of the metal contacts,...
Analog Level by BCD Thumbwheel Switch
BCD Thumbwheel Switch is used to input-set data in digital form, this can be read by digital circuits, uC and uP systems and PLC-SCADA Interfaces. Temperature Measurement and Control In the early transition of...
Simple Printer Port Interface
Printer Port Circuit to see the inputs logic state and drive a few outputs. The preset control program helps test out the circuit operation. Use safe 5V Levels. Simple Printer Port Interface, Input-Output –...
Differential to TTL convertor using LM339
Some outputs are via Dual Differential Line Driver type DS8830. This device will interface with standard TTL systems. The differential outputs are balanced and are designed to drive long lengths of coaxial cable, strip...
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.
