In this project we will design and built a Low Current Reference Source which has four switched ranges, namely; 100μA, 200μA, 300μA and 400μA. No calibration is required and it will operate from a standard 9 volt battery with no on/off switch. The unit will have an accuracy of ±0.5% or better. This project […]
Month: March 2016
Design & Build a GPS locked Frequency Standard – Part 4
In this 4th part of this project we upgrade the software to give satellite data and frequency lock display. Plus the current frequency on the display is improved to give reading in MHz, KHz or Hz. The new software version can be downloaded from the link below: http://www.scullcom.com/GPS_Ref_Version6.zip PLEASE NOTE TO COMPILE THIS CODE YOU […]
Operational Amplifier (OP AMP)
An OP Amp or Operational Amplifier is a differential input, single ended output amplifier. The gain of these amplifiers is determined by an external feedback element which is usually a resistor network. The symbol for a OP Amp is below: The name “Operational Amplifier” originated from the fact that devices of this design were originally […]
Resistor Basics
A resistor is a passive two-terminal electrical component that implements electrical resistance as a circuit element. Resistors act to reduce current flow, and, at the same time, act to lower voltage levels within circuits. RESISTOR TYPES Carbon Composition These are general purpose resistors with excellent transient and surge handling capabilities. The resistance value of this […]
Design & Build a GPS locked Frequency Standard – Part 3
In Part 3 of this project we will add a keypad for direct frequency entry and program the GPS module on the fly directly from the Arduino Nano. We will also add a battery check feature and make some changes to the original circuit. A new PCB design will allow all components to be on […]
Design & Build a GPS locked Frequency Standard – Part 2
In Part 2 of this project we will improve the reception of the GPS module and build the project on to printed circuit boards and test the unit. In addition we will look at ways of converting the 10MHz square wave to a sine wave. Below are links to download the schematics and PCB […]