Category: Schematic
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How much performance can you really get out of ordinary transistors?
I’ve been digging into a classic Motorola Class-AB amplifier and collected a clear, structured explanation of how each functional block works – feedback, bootstrapping, biasing, stability – all built from basic BJTs. To make it hands-on, I also recreated the full circuit in KiCad so you can simulate it yourself and see how much elegance…
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The Symmetric Wilson Current Mirror – Free KiCad PCB Design Files
Get the free Kicad PCB design files of the Symmetric Wilson Current Mirror – And start build your own for your DIY audio projects. Get the Kicad files from Github, and order where you want : (Both versions available. Future updates too.) https://github.com/ufelectronics/Symmetric_Wilson_Current_Mirror – Or order directly from PCBWay : (Plain version, without…
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Motorola Class AB BJT Amplifier – Free PCB design Downloads
Build and experiment with the Motorola BJT Amp discussed on my LinkedIn profile back in November and December. Download the KiCad files for free from my Github repo: https://github.com/ufelectronics/classAB-motorola-PCB-layout If you missed it, I once shared the KiCad file for simulating the Motorola AN-484A transistor amplifier. Now I’m sharing the KiCad files for…
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Free KiCad schematic for a 50W to 145W Audio Power Amplifier
This is a basic high power audio amplifier constructed by Bob Cordell. Understanding this audio power amplifier sets the ground for understanding high power, transistor based audio amplifiers. – That is my experience. In his book ‘Designing Audio Power Amplifiers’ you will find detailed explanations on how the various parts of it work. – Very…
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Free KiCad schematic for a BJT based LC Colpitts Oscillator, 5 – 8 MHz
This oscillator is based on two transistors. No crystals, by purpose. It can oscillate on various frequencies between 4.8 MHz and 8 MHz. With a variable capacitor (around 15 – 400 pF) instead of C2, you can dynamically vary the frequency in parts of that range. Its functionlity is verified by real world build and…