Pulsar
2
Service Manual
OPTIKON 2000
Cod. 111004SEN Rev.C
5-15
signal. This quick response enables the microprocessor, that controls the VCO,
to dynamically correct possible changes, due to changes in the load, of the
handpiece resonating frequency.
Piezo handpiece is connected to J1 card connector and is driven by a sinusoidal
voltage of variable frequency and amplitude. The frequency of the voltage
supplied to the handpiece is automatically adjusted by the control circuit in
order to match the resonating frequency of the acoustic vibrator.
Frequency ranges from 37.5 to 44 KHz.
The amplitude of the voltage supplied to the handpiece determines the stroke
at the edge of the ultrasonic tip. Amplitude is changed by the control circuit
according to the U/S POWER value set by the operator.
This amplitude ranges from 100 to 500 V (peak).
AMPLIFIER
U/S
VCO
PHASE
DETECTOR
CONTROL
LOGIC
ADJUSTABLE
POWER SUPPLY
TO HANDPIECE
U/S Amplifier Section
The sinusoidal voltage supplied to the handpiece is picked up at the secondary
winding of L1 transformer and filtered through L3 and C9.
L1 primary winding is the load of the U/S amplifier, consisting of the two
power MOSFET (Q2 and Q3), operated by the U5 driver.
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