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OITPC - Output inclusive TPC (not TMC)
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Old 19th November 2018, 06:11 AM   #101
bimo is offline bimo  Indonesia
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Default Pelatuk OIPC

I have many variation of this topology, and I called it Pelatuk (a bird name) amplifier. Now, I want to change the compensation with OITPC. The goal of this amplifier is cheap enough, use transistors that easily to find in my country, and simple enough.
Attached Images
File Type: png PelatukOITPC.png (90.3 KB, 341 views)
Attached Files
File Type: asc Pelatuk vmos OITPC.asc (18.0 KB, 26 views)
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#Perkutut#Emprit#GagakHitam#Elang#Pelatuk#Colibri# Blameless100#Blameless150#Blameless1200#AX14Mod#FX 8Mod#AX11Mod#LM1875InvertingWithBuffer#LM3886Inter tingWithBufferAndDCServo#more...
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Old 22nd November 2018, 03:51 AM   #102
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Quote:
Originally Posted by bimo View Post
I have many variation of this topology, and I called it Pelatuk (a bird name) amplifier. Now, I want to change the compensation with OITPC. The goal of this amplifier is cheap enough, use transistors that easily to find in my country, and simple enough.
This is PCB layout but not tested.
Please compare with simulation file (sometime I made mistake when convert schematic from simulation file to PCB layout software).
Attached Files
File Type: zip Pelatuk VMOS OITPC.zip (122.0 KB, 36 views)
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#Perkutut#Emprit#GagakHitam#Elang#Pelatuk#Colibri# Blameless100#Blameless150#Blameless1200#AX14Mod#FX 8Mod#AX11Mod#LM1875InvertingWithBuffer#LM3886Inter tingWithBufferAndDCServo#more...
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Old 25th November 2018, 04:10 AM   #103
bimo is offline bimo  Indonesia
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Quote:
Originally Posted by bimo View Post

I think this amplifier have great potential.
I want less distortion in high frequency. In the latest simulation, I use 2 sets of vertical mosfet with 45VDC PSU. It reduce high frequency distortion slightly and increase the slew rate.
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#Perkutut#Emprit#GagakHitam#Elang#Pelatuk#Colibri# Blameless100#Blameless150#Blameless1200#AX14Mod#FX 8Mod#AX11Mod#LM1875InvertingWithBuffer#LM3886Inter tingWithBufferAndDCServo#more...
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Old 17th December 2018, 09:32 AM   #104
bimo is offline bimo  Indonesia
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I sim symmetry topology with cascode LTP dan Hawksford cascode VAS, which is very common design and output TEF. All BJT. Compensation is OITPC. It is very difficult to implement OITPC using output BJT rather than mosfet. I use 90VDC PSU.

This is loop gain and THD 20.
Attached Images
File Type: png Loopgain_sim.png (170.3 KB, 184 views)
File Type: png THD20_sim.png (200.1 KB, 179 views)
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Old 17th December 2018, 12:07 PM   #105
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Quote:
Originally Posted by bimo View Post
I sim symmetry topology with cascode LTP dan Hawksford cascode VAS, which is very common design and output TEF. All BJT. Compensation is OITPC. It is very difficult to implement OITPC using output BJT rather than mosfet. I use 90VDC PSU.

This is loop gain and THD 20.
Yes, triple BJT OPS introduces more phase shift (and harder to stabilize)than simple mosfet OPS.
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Old 19th December 2018, 10:21 AM   #106
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Another simulation
The loop gain and THD20 at 8 Ohm.
Attached Images
File Type: png loopgain_sim_u.png (121.2 KB, 115 views)
File Type: png THD20_sim_u.png (175.8 KB, 112 views)
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#Perkutut#Emprit#GagakHitam#Elang#Pelatuk#Colibri# Blameless100#Blameless150#Blameless1200#AX14Mod#FX 8Mod#AX11Mod#LM1875InvertingWithBuffer#LM3886Inter tingWithBufferAndDCServo#more...
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Old 19th December 2018, 10:29 AM   #107
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Quote:
Originally Posted by bimo View Post
Another simulation
The loop gain and THD20 at 8 Ohm.
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Old 21st January 2019, 06:49 AM   #108
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Quote:
Originally Posted by bimo View Post
This is PCB layout but not tested.
Please compare with simulation file (sometime I made mistake when convert schematic from simulation file to PCB layout software).
This is Pelatuk OITPC built by my friend.
Attached Images
File Type: jpeg PelatukOITPC.jpeg (68.6 KB, 36 views)
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Old 21st January 2019, 08:50 AM   #109
dadod is offline dadod  Croatia
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Quote:
Originally Posted by bimo View Post
This is Pelatuk OITPC built by my friend.
So how it sound?
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Old 21st January 2019, 09:00 AM   #110
bimo is offline bimo  Indonesia
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Quote:
Originally Posted by dadod View Post
So how it sound?
According to my friend, he like the sound, specially the bass (many Indonesia people love the quality of the bass).

I have 4 pcs PCB, given by my other friend, but I have not build it, yet.
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