TDA7293DCpro
The
TDA7293DCpro is blessed with a Balanced Input and
a DC protection. Should the TDA7293 chip amp fail
for any reason, a relay will disconnect the loudspeaker,
thus saving the speaker from expensive damage. The
relay is designed for a 3 sec delay on power-up. This
eliminates nasty pops when the TDA7293DCpro is switched
on.
The
Op Amp used for the Balanced Input is powered by 7815
and 7915 voltage regulators. This ensures clean supply
to the NE5532AN Op Amp. The relay on the other hand,
is powered from a separate 7809 regulator.
A
feature not often seen is a potentiometer to adjust
the sensitivity to match dBu or dBV. This is useful
for professional use because the actual power output
can be verified by the Led Bargraph in the mixer.
 1kHz
Full Power into 8Ω |
 10kHz
Square Wave into 8Ω |
TDA7293DCpro
Specifications
Power
Output = 36W into 8Ω | 60W into 4Ω
Input Sensitivity = 1.0V RMS (Unbal) | 0.5V RMS (Bal)
Input Impedance = 20K
Rise Time = 3.2us at 10kHz Sq into 8Ω
Voltage Gain = 30dB
Power
Supply Specs
Power transformer = 20-0-20Vac
Supply Rails = +/- 28Vdc
PCB
= 4.0" X 3-5/8" (100mm x 92mm)
Double Sided | FR4
The
TDA7293DCpro is one channel and is
supplied Unassembled. Two kits are
required for stereo.
To
complete the amplifier, the following are
needed
1) a power supply consisting of a power transformer,
filter capacitors and a bridge rectifier
2) a heatsink for the TDA7293 chip amp
3) a metal case and the necessary connectors
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