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Title: Multivoltage Limiter - Jim Limiter Post by: IN3IEX on March 28, 2012, 03:19:08 AM Hi Jim! Your limiter is great.
http://amfone.net/Amforum/index.php?topic=22341.0 You can see from the simulations. With three voltage levels it is very progressive. As soon as the waveform goes near zero it becomes stronger and stronger, but never makes a flat clipping. The simulations are the same circuit with a progressive reduction of the number of diodes. To find which waveform is associated to a circuit just see the name of the waveform, that reports the resistor to which it is related. Well done Jim! Title: Re: Multivoltage Limiter - Jim Limiter Post by: WD5JKO on March 28, 2012, 07:49:47 AM Georgio, Thank You for the kind words. I did that circuit a long time ago, hence the W4CJL stamp on the documents. This guy, Hoisey Hosington was the founder of SPAM. I will follow up later, but that circuit has evolved over the years into other rigs with working examples on my Retro-75 (posts here on amfone), and my Gonset G-76 (posts on amforever). These both used a single passive keep alive supply, but still employ the concept of negative cycle attenuation, instead of loading. The G-76 case using a tube modulator needed an additional diode and resistor to maintain the modulator P-P load impedance when the negative cycle is being attenuated. Jim WD5JKO |