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Old 22nd October 2012, 01:20 AM   #1
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Default Prototype power amplifier

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 90 (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

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Voltage amplifier and corrent (one Channel)
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mounting board of the voltage amplifier (one channel)
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Last edited by jonstanza; 22nd October 2012 at 01:47 AM.
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Old 22nd October 2012, 01:39 AM   #2
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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

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Rear
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design mechanical (support for the capacitors nichicon gold tune), four unit
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piece, with the capacitors nichicon each 22000uf/63V

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regards
jon
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Old 22nd October 2012, 03:04 AM   #3
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output power transistor. It is possible to see one of the channels already mounted without heatsink
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Ceramic insulation
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temperature sensor Airpax 67F090 and output power transistor
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one channel
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power supply for voltage amplifier
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system control
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one channel...
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mechanical parts made ​​by a company related to aerospace industry
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power supply + system control
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board power supply to output transistor (exicon)
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best regards
jon
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Old 22nd October 2012, 07:47 AM   #4
Jay is offline Jay  Indonesia
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Superb!
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Old 22nd October 2012, 08:07 AM   #5
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Look verygood, very professional!!!
Can you show schematic?!
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Old 22nd October 2012, 07:19 PM   #6
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thank you

Attached more pictures of prototype

detail of the fixing of capacitors
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1000VA transformer (talema) is modified mode fixation
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Damping of transformer
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diodes from IXYS (DSEI60-02A) 69A 200V 35ns (assembling the wiring)
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Top board (system control of amplifier)
Bottom board (power supply to voltage amplifier)
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signal inputs (one RCA and two XRL in each channel) and outputs (in assembly)
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a choice detailed for relay output (mors smitt series B400)
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Compared to a omron (G2R-1)
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regards
jon

Last edited by jonstanza; 22nd October 2012 at 07:39 PM.
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Old 8th November 2012, 08:45 PM   #7
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final photos of project


test crash.... SOA (safe operating area)
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side A-B
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front panel
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1
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2
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rear 1
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rear 2
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Top + rear
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regards
jon
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Old 8th November 2012, 09:02 PM   #8
rsavas is offline rsavas  Canada
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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
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Old 7th April 2013, 11:49 AM   #9
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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.
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Old 7th April 2013, 05:44 PM   #10
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Quote:
Originally Posted by rsavas View Post
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
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
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