he amplifier circuit uses the basic circuitry of the 70W power amplifier, but modified
for true Class-A operation - it should be pretty nice! This amp has been built by
several readers, and the reports I have received have been very positive.
With simulations, everything appears to be as expected, but although I have yet to
actually build it and test it out thoroughly, no-one has had any problems so far. Using +/-20 Volt supplies - either conventional, regulated or using a capacitance multiplier, it should actually be capable of about 22 W before clipping, but expect to use a big
heatsink - this amp will run hot.l.)Rangkaian 20 Watt Class-A Power Amplifier
The current sink shown should have very high linearity, since it is based on the same
concept as the output stage devices. The 0.25 Ohm resistor should cause little grief (4
x 1 Ohm 1W resistors in parallel), but some experimentation may be needed here, since
the base-emitter voltage of the BC549 determines the current. This circuit works by
using the BC549 to steal any excess base current from the compound pair. As soon as the
voltage across the 0.25 Ohm resistor exceeds 0.65V, the transistor turns on and achieves
balance virtually instantly.The 1k trimpot in the collector of the first LTP transistor allows the DC offset to be
adjusted. The nominal value is around 400 ohms, but making it variable allows you to set
the output DC offset to within a few mV of zero.
1000 Watt Power Amplifier
his is a scheme set 1000watt power amplifier. Currently I do not have a picture to the circuit board, but because the amplifier circuit is quite simple, you can design it
yourself PCB easily. Or you can order it at the store PCB audio kit in the center of electronic singosaren oriental, solo.the assemble cables for DC power supply and output transistors must be large, use size
1.5-3mm for large current passed. The supply used transformer with 20A/45Ct and at least
4x10000uf/80 volt capasitor. this circuit is able to supply power 10000watt therefore
the power transistor will be very hot, give good cooling fan on the power transisitor
Transitor alternative to replacement of the 2SA1494 is 2SA1216 From SANKEN. The
transistor has a 200-350 watt power dissipation of each pair so that for long-term
operation of more durable. Keep in mind, usually sold a pair of power transistors with
its complement, so you can not buy 2SC2922 alone without 2SA1216 or 2SA1494 without
2SC3858. The price range for transitor tsb is 30-40 thousand Rupiah / pair.
sumber skema-amplifier.blogspot.com
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