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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:
-
fairly high power output
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easy to construct
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use common components
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no oscillations
-
have current limit protection
- above
average hifi performance
-
bridgeable for HT subs
- rugged
enough for party use
c200 specifications
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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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