2 layers

Bjtcc

Royer sinewave oscillator

Copper layers: 2
Thickness: 1.6 mm
Parts: 9
Nets: 10
Pads: 26
Tracks, vias: 0, 0
Routed: Not yet
KiCad: KiCad 4
Created: 16 Apr 2017
Updated: 18 May 2017

Overview

Bjtcc is an open-source printed circuit board by emard, from the emard/royer repository on GitHub. It is a 2-layer board with 9 parts on 10 nets.

Its parts include 3 resistors, 2 diodes, 2 transistors and 2 connectors.

README

README.md

Royer - simple sinewave oscillator

Schematics and some PCBs practice in kicad with several variations (BJT, MOSFET, IGBT) of simple sinewave oscillators, initially published by:

text

George H. Royer
Electrical Manufacturing
December 1954

Royer oscillator uses zero-voltage switching (ZVS) to the parallel LC resonant circuit. Voltage at LC is sinewave when oscillator is unloaded. More load will more deform the sinewave.

About regulated Royer see:

text

Jim Williams
Linear Technology
Application note 118
March 2008

It needs a sufficiently large choke in series with middle turn of resonant L. If muddle turn is not available then 2 chokes can be used.

Parts

Qty	Value	Footprint	References
2	1N5819	Diodes_ThroughHole:Diode_DO-35_SOD27_Horizontal_RM10	D1, D2
2	47	Resistors_ThroughHole:Resistor_Horizontal_RM15mm	R1, R3
2	ASZ15	TO_SOT_Packages_THT:TO3	Q1, Q2
1	1k	Resistors_ThroughHole:Resistor_Horizontal_RM15mm	R2
1	CONN_02X01	Buttons_Switches_ThroughHole:SW_PUSH_6mm_h5mm	P1
1	Screw_Terminal_1x04	Pin_Headers:Pin_Header_Straight_1x04	J1

Questions

What parts does the Bjtcc use?

9 parts. The full list of its parts is on this page, with links to each part's symbol and footprint where PCBKit's library has them.

Where can I download the Bjtcc KiCad files?

From the emard/royer repository on GitHub, at the commit this page was made from: the board is BJTGECC-3V/kicad/pcb/bjtcc.kicad_pcb. PCBKit opens the board in the browser, with nothing to install.

Can I use the Bjtcc design in my own project?

Its repository states no licence, so its author keeps all rights: ask emard before reusing the design.

Project files

Show this board on your page

A live frame, for any web page

<iframe src="https://pcbkit.io/embed/boards/emard-royer-bjtcc" title="Bjtcc in PCBKit" width="100%" height="480" style="border:0;border-radius:12px" allow="fullscreen" loading="lazy"></iframe>

A picture

<img src="https://pcbkit.io/embed/boards/emard-royer-bjtcc.jpg" alt="Bjtcc" width="1200" height="900">

A picture that opens the board, for a README

[![Bjtcc](https://pcbkit.io/embed/boards/emard-royer-bjtcc.jpg?size=s)](https://pcbkit.io/boards/emard-royer-bjtcc)

Source

Repository: emard/royer
Board file: BJTGECC-3V/kicad/pcb/bjtcc.kicad_pcb
Commit: ff3b395
Licence: Not stated

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