![]() ![]() Yes, power transformers are never supposed to encounter any DC on their primary. Sadly, this also leads to their problem: an inability to sustain a DC offset. Toroids offer many advantages, such as a much smaller, flatter size, and less radiating hum-all of which is the result of having a tight magnetic circuit in their wound steel-strip cores. Why? I often use toroidal power transformers. ![]() Why? Answer: 6.3Vac secondaries.įor decades I have wanted to make a DC-Block PCB. (Note the three heatsinks.) Unlike the PS-21, the PS-21B uses a voltage-doubler-rectifier circuit for the low-voltage regulators. Just like the PS-21, the new PS-21B holds three independent regulated power supplies: one high-voltage and two low-voltage regulators. This is not a replacement for the existing PS-21, but is a brother tube power supply (note the B in 'PS-21B"). Most of my previous attenuators were, such the A3, Atten-1, Attn-2, M1, a blend of series and ladder. I decided to create a new stepped attenuator based entirely on the ladder structure.
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