What is an Op Amp Oscillator? An op amp oscillator is an amplifier that uses feedback and resulting hysteresis to cause oscillation. The circuit only requires five components. The output will be a square wave – the frequency of which is determined by a resistor and capacitor. This circuit is configured for 1kHz. The hysteresis() is determined by the value […]
5V/USB Transistor Soft Latch
This article describes the 5V version of a previous 12V transistor soft latch push on, push off switch circuit. It also incorporates an improvement over the 12V version that provides for better switch de-bouncing, as well as an inverting output stage, so that the circuit defaults to “off”. The parts list and picture of the breadboard can be found in […]
BJT Logic Gates
This article describes how Bipolar Junction Transistors can be easily configured to act as logic gates when used in their “on” and “off” states. Five popular logic gate types will be described and constructed in this article and accompanying video. The five types are the: Inverter (or NOT) gate AND Gate NAND Gate OR Gate NOR Gate TTL Logic Levels […]
Current Mirror using Transistors
What is a Current Mirror? A current mirror is a circuit that takes the current through one load and “copies” it through a load on another branch of the circuit. The current mirror also provides a constant current source through that target load. BJT (Bipolar Junction Transistor) Current Mirror Design Basic Configuration The basic configuration for the BJT current mirror […]