dear sirs
After two projects (prototype preamplifier and phono stage), I decided to develop a power amplifier for this set.
The amplifier is divided into two sections amplifier (voltage and current amplifier), each section has a dedicated power supply.
The output stage is based on transistors (lateral mosfet) of EXICON. The power is estimated at 150 W for 8 ohm.
I developed a Protective circuit to protect the amplifier and speakers
-Over lood (turns off the current sector)
-DC output more 2 Volt (turns off the current sector)
-HF
-Temp. more 90º (turns off the current sector)
Input imp. 15Kohm
bandwith. 0-250 Khz (limited with input filter)
Weight... heavy
The software used for the design of the board is the Altium Designer... excellent and sophisticated.
Attached the first photos (developing the boards in Altium Designer).
Board (power voltage gain) and system control
Voltage amplifier and corrent (one Channel)
mounting board of the voltage amplifier (one channel)
After two projects (prototype preamplifier and phono stage), I decided to develop a power amplifier for this set.
The amplifier is divided into two sections amplifier (voltage and current amplifier), each section has a dedicated power supply.
The output stage is based on transistors (lateral mosfet) of EXICON. The power is estimated at 150 W for 8 ohm.
I developed a Protective circuit to protect the amplifier and speakers
-Over lood (turns off the current sector)
-DC output more 2 Volt (turns off the current sector)
-HF
-Temp. more 90º (turns off the current sector)
Input imp. 15Kohm
bandwith. 0-250 Khz (limited with input filter)
Weight... heavy
The software used for the design of the board is the Altium Designer... excellent and sophisticated.
Attached the first photos (developing the boards in Altium Designer).
Board (power voltage gain) and system control
An externally hosted image should be here but it was not working when we last tested it.
Voltage amplifier and corrent (one Channel)
An externally hosted image should be here but it was not working when we last tested it.
mounting board of the voltage amplifier (one channel)
An externally hosted image should be here but it was not working when we last tested it.
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With the help of software Auto-CAD in conjunction with our imagination is possible to create a housing with a personal designer.
structure of the general plan
Rear
design mechanical (support for the capacitors nichicon gold tune), four unit
piece, with the capacitors nichicon each 22000uf/63V
regards
jon
structure of the general plan
An externally hosted image should be here but it was not working when we last tested it.
Rear
An externally hosted image should be here but it was not working when we last tested it.
design mechanical (support for the capacitors nichicon gold tune), four unit
An externally hosted image should be here but it was not working when we last tested it.
piece, with the capacitors nichicon each 22000uf/63V
An externally hosted image should be here but it was not working when we last tested it.
regards
jon
output power transistor. It is possible to see one of the channels already mounted without heatsink
Ceramic insulation
temperature sensor Airpax 67F090 and output power transistor
one channel
power supply for voltage amplifier
system control
one channel...
mechanical parts made by a company related to aerospace industry
power supply + system control
board power supply to output transistor (exicon)
best regards
jon
An externally hosted image should be here but it was not working when we last tested it.
Ceramic insulation
An externally hosted image should be here but it was not working when we last tested it.
temperature sensor Airpax 67F090 and output power transistor
An externally hosted image should be here but it was not working when we last tested it.
An externally hosted image should be here but it was not working when we last tested it.
one channel
An externally hosted image should be here but it was not working when we last tested it.
An externally hosted image should be here but it was not working when we last tested it.
power supply for voltage amplifier
An externally hosted image should be here but it was not working when we last tested it.
system control
An externally hosted image should be here but it was not working when we last tested it.
one channel...
An externally hosted image should be here but it was not working when we last tested it.
mechanical parts made by a company related to aerospace industry
An externally hosted image should be here but it was not working when we last tested it.
power supply + system control
An externally hosted image should be here but it was not working when we last tested it.
board power supply to output transistor (exicon)
An externally hosted image should be here but it was not working when we last tested it.
An externally hosted image should be here but it was not working when we last tested it.
best regards
jon
thank you
Attached more pictures of prototype
detail of the fixing of capacitors
1000VA transformer (talema) is modified mode fixation
Damping of transformer
diodes from IXYS (DSEI60-02A) 69A 200V 35ns (assembling the wiring)
Top board (system control of amplifier)
Bottom board (power supply to voltage amplifier)
signal inputs (one RCA and two XRL in each channel) and outputs (in assembly)
a choice detailed for relay output (mors smitt series B400)
Compared to a omron (G2R-1)
regards
jon
Attached more pictures of prototype
detail of the fixing of capacitors
An externally hosted image should be here but it was not working when we last tested it.
1000VA transformer (talema) is modified mode fixation
An externally hosted image should be here but it was not working when we last tested it.
An externally hosted image should be here but it was not working when we last tested it.
An externally hosted image should be here but it was not working when we last tested it.
An externally hosted image should be here but it was not working when we last tested it.
Damping of transformer
An externally hosted image should be here but it was not working when we last tested it.
diodes from IXYS (DSEI60-02A) 69A 200V 35ns (assembling the wiring)
An externally hosted image should be here but it was not working when we last tested it.
An externally hosted image should be here but it was not working when we last tested it.
Top board (system control of amplifier)
Bottom board (power supply to voltage amplifier)
An externally hosted image should be here but it was not working when we last tested it.
An externally hosted image should be here but it was not working when we last tested it.
signal inputs (one RCA and two XRL in each channel) and outputs (in assembly)
An externally hosted image should be here but it was not working when we last tested it.
a choice detailed for relay output (mors smitt series B400)
An externally hosted image should be here but it was not working when we last tested it.
Compared to a omron (G2R-1)
An externally hosted image should be here but it was not working when we last tested it.
regards
jon
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final photos of project
test crash.... SOA (safe operating area)
side A-B
front panel
1
2
rear 1
rear 2
Top + rear
regards
jon
test crash.... SOA (safe operating area)
An externally hosted image should be here but it was not working when we last tested it.
side A-B
An externally hosted image should be here but it was not working when we last tested it.
front panel
An externally hosted image should be here but it was not working when we last tested it.
1
An externally hosted image should be here but it was not working when we last tested it.
2
An externally hosted image should be here but it was not working when we last tested it.
rear 1
An externally hosted image should be here but it was not working when we last tested it.
rear 2
An externally hosted image should be here but it was not working when we last tested it.
Top + rear
An externally hosted image should be here but it was not working when we last tested it.
regards
jon
Well done, must have cost you a bundle of $, the aluminum work & many PCB's
Planning on selling this?
Do I see an AIRPAX thermal switch? sitting on top of a LatFet? Why there and not directly on the HS?
Found a spelling mistake, "PORTANT" on Power Voltage Gain Stage PCB,SPV-b.v1 should be "IMPORTANT"
Rick
Planning on selling this?
Do I see an AIRPAX thermal switch? sitting on top of a LatFet? Why there and not directly on the HS?
Found a spelling mistake, "PORTANT" on Power Voltage Gain Stage PCB,SPV-b.v1 should be "IMPORTANT"
Rick
Have been long time, Stanza. Your project look very professional. I think they're better than other commercial bran.
Can you show schematic? The value of parts/components can be hide, if you want.
They're look like you use dual JFET 2N5566 folded cascode.
Can you show schematic? The value of parts/components can be hide, if you want.
They're look like you use dual JFET 2N5566 folded cascode.
hi Rick
Thank you for your attention, the error has been corrected.
if for some reason the heating of the transistor is too high the (AIRPAX thermal switcht) response is faster.
regards
jon
hi Walkatone
I'll make an exception. Only the block diagram. The voltage amplifier, current amplifier-output and protection circuits (DC, overload)
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