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Old 5th November 2012, 02:18 PM   #1
diyAudio Member
Join Date: Feb 2004
Location: Jamaica
Default Gate Driver Transistors Cadence ZRS7500 similar to Hifonics

Anyone familiar with this amplifier. I recently got this amplifier which is totally burnt out; all 12 output fets and gate resistors 4 gate transistors and the 105 cap along with 12 outputs were burnt.
What I am not sure of is the type of driver transistors to use, Hifonics has 2 NPN and 2 PNP the PNP is connected collector to the ground and NPN collector to the positive of the 12v supply . In this amplifier the collector of the front and back transistor is connected to the ground of the 12v supply and the two in the middle is connected to the ground of Secondary Transformer windings.
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Old 12th November 2012, 12:50 PM   #2
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Join Date: Feb 2004
Location: Jamaica
Default Problem solved

It is the same design as the hifonics, It has the NPN connected to the positive 12v and PNP connected to the ground both bases driven by the power supply pwm card and emitters together through a 47 ohm resistor for each output two transistors drives one side of each bank for both power supply. -+62volts
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