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Alpine MRP-F300 and MRP-F600 schematic
Alpine MRP-F300 and MRP-F600 schematic
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Old 11th May 2019, 06:27 AM   #1
oPossum is offline oPossum  United States
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Default Alpine MRP-F300 and MRP-F600 schematic

I am looking for a schematic or service manual for these amps. I have been repairing class AB amps for 30+ years and can usually stare at the amp for a while and make a basic schematic in my head. There are only a few common amp topologies and a few common protections circuits. These Alpine amps have the usual three stage emitter follower output, but I am having difficulty with what exactly precedes that. They are both currently working, so I am not looking for repair help. I just want to understand the amplifier topology that is used.
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Old 11th May 2019, 07:13 AM   #2
Perry Babin is offline Perry Babin  United States
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http://www.bcae1.com/temp/MRPF300%20-%20SERVICE.pdf
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Old 11th May 2019, 08:02 AM   #3
oPossum is offline oPossum  United States
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Thanks!

That little 5 pin SMD part is a dual transistor as I expected. Just a few tweaks to an ordinary differential amp front end. The second transistor in the bias is unusual. Not the typical complimentary 2 transistor bias circuit.
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