Op amps and comparators are the main focus of this page. The particular component (part number) you need to use will depend on the demands of the circuit you are building as they each have their own strengths and weaknesses.
Key topics to learn about:
Info here is not guaranteed to be accurate. Always consult the component’s datasheet or more authoritative informational sources.
- Common op amps and comparators with varying properties that should be studied. Listed in no particular order. They typically have LM or uA in front of them depending on manufacturer: 741 – 358 -393 –
- Non inverting input. (+)
- Inverting input. (-)
- Dual supply (outputs short of supply voltages)
- Single supply (outputs to negative/ground supply voltage)
- Rail to Rail (outputs to both supply voltages)
- Open collector/drain (output is either “off” or connected to ground)
- Inputs just look at voltage. They leak a very small amount of current though, so very weak signals may need a higher impedance input op amp/comparator IC.
Non inverting single supply op amp comparator
White version of the oscilloscope that I use in many of my recent videos.
Inverting op amp comparator:
Diagram below looks like the one above, but the inverting (-) input and non inverting (+) input locations are swapped. It is always important to pay close attention to which input is above the other in the schematic.
Screwdriver set that I use in my videos.
Voltage followers take the input voltage and output the same voltage. The power provided to the load in this case is provided by the op amp (which gets it’s power from the power supply) so that a weak signal does not lose it’s voltage.
Power supply I use in my videos.
The ad above is where I got my LCR meter. It is not a replacement for a multimeter, but is a nice additional meter for getting more info about inductor, capacitor and resistor components than you can get from a standard multimeter.
Kit that has everything you need to learn basic electronics and Arduino.
My 74LS00 series IC kit (assuming they haven’t changed it at all)
74HC00 kit that is similar to mine, which isn’t available anymore. List of included IC’s is shown in the images.
4000 series IC kit I have (assuming they don’t changed part numbers)
Other pages in the short videos with diagrams series
- Short learning electronics videos with diagrams collection – Page 1 Resistor and LED component circuits.
- Page 2 Capacitor circuits.
- page 3 555 timer circuits.
- Page4 Bipolar Junction Transistor (BJT) circuits.
- Page 5 More BJT circuits.
- Page 7 dual supply op amp circuits
- Page 8 less commonly used components for basic electronics
- Page 9 other integrated circuits including logic gates 7400 4000 HC LS
Art of electronics is my favorite book!