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The c200 is the result of numerous diyers' request for a basic
discrete power amplifier. As such, this amplifier is specially
designed to meet the following:
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fairly high power output.
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easy to construct.
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use common components.
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no oscillations.
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have current limit protection.
- above
average hifi performance.
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bridgeable for HT subs.
- rugged
enough for party use.
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Power
Output
Output
of the c200 into 8 ohms before clip is 125 Watts. When loaded
to 4 ohms, the output is increased to 200 Watts. With 2 channels
operating in bridged mode, power output is a respectable 400
watts into 8 ohms.
Output
Transistors
For easy procurement, very common
transistors have been chosen for the c200. The power transistors
comprise of 4 pieces of MJ15003
and MJ15004. Though "slow" (fT=2MHz) by today's
standards, these transistors are easily available, reasonably
priced, has sufficient power rating and the necessary SOA
for audio. For those who prefer to use 2N3055
and MJ2955, the c70
model, with 70 Watts/RMS output is available.
Vas
& Drivers
TIP29C/30C
are used for these stages. Though equally slow (fT=3MHz),
they are chosen based on availability and cost.
Input
Differential
2N5551
is used for input. Again, this is a common part number with
properties suitable for audio.
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