Phase Linear 300 redesign

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I recently completed a redesign of the Phase Linear 300 amplifier. I designed a new driver circuit that used the existing circuit as a starting point. I kept the common base amplifiers and the op amp input circuit, I changed the compensation and bias circuits and finally changed the outputs from bipolars to lateral MOSFETs. I retained the power transformer and heat sinks and chassis from the original amplifier.

I laid out the pc boards with kiCAD and they are 4 layer boards with 2 signal layers, a power plane layer and return plane layer. The original power transformer output voltage sags a bit under full load which limits the output power to about 125 watts at 8 ohms. The circuitry is capable of over 200 watts.

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Topic - Phase Linear 300 redesign - Tiberius 04:59:24 08/06/24 (10)

RE: Phase Linear 300 redesign - Tiberius 08:56:25 10/05/24 (0)

RE: Phase Linear 300 redesign - Mike Mount 16:02:58 09/10/24 (2)

RE: Phase Linear 300 redesign - Tiberius 17:34:05 09/10/24 (1)

RE: Phase Linear 300 redesign - farfetched 05:10:46 09/11/24 (0)

show us a pic when you can, my brother had a beautiful Phase Linear 700 /nt - Story 15:22:30 08/14/24 (0)

RE: Phase Linear 300 redesign - hawkmoon 03:32:55 08/07/24 (0)

Nice work! Looks clean. - Ralph 14:44:04 08/06/24 (3)

RE: Nice work! Looks clean. - Tiberius 15:25:34 08/06/24 (2)

Good to see those older Phase linears put to use. - Ralph 10:47:15 08/13/24 (1)

RE: Good to see those older Phase linears put to use. - Tiberius 12:36:48 08/13/24 (0)

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