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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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Uneven DIY coils for RF are a past
Winding them with bare copper wire: * They won’t get an even distributed spacing * Handling them, changes their inductance * They partly uncoil again, as you let go Nothing is controllable. Until you take duct tape, alias ‘Panzer-tape’, alias Gaffa and what else you call it. Take a random object with the desired diameter.…
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Measuring Inductance or Capacitance without an LCR-meter
You have a DIY inductor and no LCR-meter at hand? – No problem. A known resistor in series, and some calculations make the day. L = R * sqrt(3) / ( 2 * π * f ) Example Measurements: * R1 = 99.82 Ω * Vout = Vin / 2 at 901 khz ( 901,000 Hz…