Circuit Building Blocks

The goal here is to have a page of various transistor circuits, but for now I'll include op amps.

They should be simple enough that you could combine them in a larger design (i.e. as part of an op amp or ASIC). I'm not going to include fundamental circuits (such as: https://en.wikipedia.org/wiki/Template:Transistor_amplifiers or basic op amps which you can find in Electronics for Inventors or AoE.)

These are sometimes called Topologies. Like a map. A map topology. If maps lie, then it's likely these circuits will lie as well. Expect any examples to be missing required components to work.

Transistor Circuits

Programmable Unijunction Transistor Sawtooth

Make Electronics: Learning by Discovery, Charles Platt

Quick Bits Examples

Most of these are also referenced in the Art of Electronics.

• Differential Pair
• Current Mirror (Wilson ver.)
• Bandgap Voltage Reference - Limiting temperature effects in semiconductors.

Unity Gain

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  Similar diamond buffer made with op amp. Note the transistors are powered by the supply rails of the op amp.

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  Fairchild example of the diamond buffer.

• https://en.wikipedia.org/wiki/Diamond_buffer - Unity gain, high current.

https://www.eevblog.com/forum/projects/opamps-die-pictures/msg5450288/#msg5450288

Op Amp Circuits

Howland Topology

• Current Source (Howland) Voltage Controlled Current Source, see also: https://www.eevblog.com/forum/beginners/current-source-with-p-channel-mosfet-not-working-as-expected/msg5447837