This is a quick update from the original 10W Amp video: https://www.youtube.com/watch?v=wBiz594O5LA In this video I do a number of measurements varying both the input signal as well as supply voltage and graph the results with Python. I also add a low pass filter design from this site and remeasure https://rf-tools.com/lc-filter/ Finally I graph the result of increasing the DC bias to the BS170s ... https://www.youtube.com/watch?v=JMlc5uohcm0

In this series I will be building a 20m SSB transceiver from this site https://www.qsl.net/v/va3iul//Homebrew_RF_Circuit_Design_Ideas/Homebrew_RF_Circuit_Design_Ideas.htm The specific transceiver is this one https://www.qsl.net/v/va3iul//Homebrew_RF_Circuit_Design_Ideas/TRX_QRP_20m_SSB.gif Link to the MC3362 datasheet http://pdf.datasheetcatalog.com/datasheet/motorola/MC3362DW.pdf ... https://www.youtube.com/watch?v=izTtZlVAlt4

In this series I will combine the Receiver and Transmitter into a single transceiver with transmit/receive switching Here's the schematic (incomplete as of posting - will continue to build on it) https://github.com/thaaraak/SDR-Transceiver Here's the datasheet for the FST3257 https://www.onsemi.com/download/data-sheet/pdf/fst3257-d.pdf Here's the relays https://www.ebay.com/itm/291762418219 0:00 Walkthrough of transceiver block diagram 1:53 RF Switch and Audio Switch highlights 2:41 Receive Path 4:45 Transmit Path 6:28 Audio Switch Details 7:41 FST3257 Datasheet walkthrough 8:58 Audio Switch implementation 10:18 Audio Switch testing 11:07 Audio Switch on the breadboard 15:43 RF Switch schematic 17:51 Relays that will be used 18:34 Wrapup and next steps ... https://www.youtube.com/watch?v=d4cmGwFpQcw

Just a quick followup from the previous video https://www.youtube.com/watch?v=JgiakIxMjfI&t=104s Where I do the two tone test against the 70 W amplifier kit. Funnily enough just after I finished the video two more IRF530s gave their lives - next vid will definitely have the temperature protection in. Here's the video and site I mentioned with all the mods https://f5npv.wordpress.com/irf530-mosfet-amplifier/ https://www.youtube.com/watch?v=m0BD5l2JrfU (thank you for the tip Peter - for some reason your comments aren't appearing on the previous video) Schematic https://github.com/thaaraak/70W-Amplifier/blob/main/70W-Amplifier.pdf 0:00 Intro 1:08 Test Setup with Magnis as Exciter 3:01 Two tone with Magnis as Baseline 3:50 Magnis on Spectrum Analyzer 5:19 Two tones not quite Pure? 5:39 Two tone from the Amplifier 7:00 Amplifier on the Spectrum analyzer 8:44 Close up of Amplifier and other mods to do 11:31 Some tests with a 15 ohm resistor at R6 (see schematic link) 11:54 on the oscilloscope 12:23 and on the spectrum analyzer ... https://www.youtube.com/watch?v=ZvDppBOvhtI