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LM3875 Gainclone Power Amplifier
This is a basic design with a single LM3875TF chip per side, and one shared toroidal transformer. I will be making two of these amplifiers simultaneously but with a few critical component differences. One is based on standard components, and one on premium components.
There was a lot of deliberation on the type of transformer to get, particularly the secondary voltages. The concern here is the target load as, generally speaking, the higher the voltage, the less suited it is to drive low impedance loads (4ohms). I settled on 20 volt secondaries which I think is a good compromise, feeling that 18v is perhaps a little too low and 22v a little too high to get the max with a 4 ohm load whilst minimising output loss if using 8 ohms. The ability to run stable at 4 ohms is paramount to me to keep it open to different applications, and output wattage is relatively unimportant for this design.
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Build your own LC Meter and start making your own coils and inductors. This LC Meter allows to measure incredibly small inductances making it perfect tool for making all types of RF coils. LC Meter can measure inductances starting from 10nH - 1000nH, 1uH - 1000uH, 1mH - 100mH and capacitances from 0.1pF up to 900nF. The circuit includes an auto ranging and "Zero Out" function to make sure the readings are as accurate as possible ... [more] |
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