First One - mosfet amplifier module - diyAudio
Go Back   Home > Forums > Commercial Sector > Vendor Forums > Vendor's Bazaar

Vendor's Bazaar Commercial Vendors large & small hawking their wares

Please consider donating to help us continue to serve you.

Ads on/off / Custom Title / More PMs / More album space / Advanced printing & mass image saving
Reply
 
Thread Tools Search this Thread
Old 10th January 2014, 12:21 PM   #1
diyAudio Member
 
Lazy Cat's Avatar
 
Join Date: Sep 2007
Lightbulb First One - mosfet amplifier module

Hi guys


Finally the First One mosfet amplifier module is ready to go to travel the world.

It has been a long testing and measuring period, just to make me sure the module is good enough to meet your expectations.

The First One V1.2 amplifier is a plug and play class AB module, current feedback type, ready made to the last detail, calibrated and tested.


Technical specifications:

Maximal power (20 Hz - 20 kHz, THD 0,1 %)
160 Wrms/8 Ohm
250 Wrms/4 Ohm

Maximal power (20 Hz - 20 kHz, THD 0,05 %)
150 Wrms/8 Ohm
230 Wrms/4 Ohm

THD (100 Wrms/4 Ohm, 10 kHz)
0,004 %

THD (100 Wrms/4 Ohm, 100 Hz)
0,0034 %

IMD (80 Vpp/4 Ohm, 19+20 kHz)
0,003 %

THD (1 Wrms/8 Ohm, 1 kHz)
< 0,0016 %

Frequency response (-3 dB)
3 Hz - 3 MHz

Slew-rate
240 V/us

Signal to noise ratio
> -110 dB

Voltage gain
+27 dB

Input impedance
10 kOhm

Output impedance (20 Hz - 20 kHz)
< 10 mOhm

Damping factor (100 Wrms/4 Ohm, 20 kHz)
> 2000, measured on PCB output terminals

Output DC offset
< +/-5 mV

Supply voltage
+/-40 V to +/-63 V

Size - dimensions (W x D x H)
100 x 50 x 40 mm


Net price for the module is 88,00 EUR

Orders welcome to esl@siol.net


Best regards,

Lazy Cat
Attached Images
File Type: jpg First One module 2.jpg (465.7 KB, 5872 views)
File Type: jpg First One module 3.jpg (483.7 KB, 5136 views)
File Type: jpg First One module 1.jpg (413.8 KB, 4746 views)
__________________
First One VSSA

Last edited by Lazy Cat; 22nd January 2014 at 10:31 PM.
  Reply With Quote
Old 10th January 2014, 12:36 PM   #2
diyAudio Member
 
Lazy Cat's Avatar
 
Join Date: Sep 2007
Plots of the First One amplifier, 40 ppm THD 10 kHz at 100 Wrms/4 Ohm

1. Input signal 10 kHz
2. Output signal 20 Vrms, no load
3. Output signal 20 Vrms on 4 Ohm
Attached Images
File Type: png 1.png (86.2 KB, 4365 views)
File Type: png 2.png (85.8 KB, 4140 views)
File Type: png 3.png (87.2 KB, 390 views)
__________________
First One VSSA
  Reply With Quote
Old 10th January 2014, 12:39 PM   #3
diyAudio Member
 
Lazy Cat's Avatar
 
Join Date: Sep 2007
Plots of the First One amplifier, 34 ppm THD 100Hz at 100 Wrms/4 Ohm

1. Input signal 100 Hz
2. Output signal 20 Vrms, no load
3. Output signal 20 Vrms on 4 Ohm
Attached Images
File Type: png 4.png (74.6 KB, 379 views)
File Type: png 5.png (74.5 KB, 246 views)
File Type: png 6.png (76.6 KB, 233 views)
__________________
First One VSSA
  Reply With Quote
Old 10th January 2014, 12:43 PM   #4
diyAudio Member
 
Lazy Cat's Avatar
 
Join Date: Sep 2007
Few square waves and rise time measurements of the First One amplifier module.

1. 50 kHz
2. 200 kHz
3. mid signal level rise time
4. high signal level rise time

Calculation from picture 4, 60 V (90% Vpp) in 250 ns results in:

Slew Rate of 240 V/us
Attached Images
File Type: jpg 7.jpg (637.2 KB, 385 views)
File Type: jpg 8.jpg (566.3 KB, 330 views)
File Type: jpg 9.jpg (662.1 KB, 307 views)
File Type: jpg 10.jpg (567.0 KB, 235 views)
__________________
First One VSSA

Last edited by Lazy Cat; 10th January 2014 at 01:05 PM.
  Reply With Quote
Old 10th January 2014, 12:44 PM   #5
diyAudio Member
 
Lazy Cat's Avatar
 
Join Date: Sep 2007
Measurement showing the First One's behaviour at 2,77 MHz sine signal.

We can see 0,9 Vpp input sine signal present on CH2 and 14,3 Vpp output signal on CH1

Calculations from the plot:

1. Voltage gain is x15,89 or +24 dB at 2,77 MHz

2. Linear voltage gain of the First One is +27 dB, meaning that 2,77 MHz is exactly -3 dB gain point

3. Phase shift at 2,77 MHz is 76

4. 10 Ohm zobel load (Zr+Zc) dissipates 2,4 Wrms at 2,77 MHz
Attached Images
File Type: jpg 11.jpg (640.9 KB, 239 views)
__________________
First One VSSA
  Reply With Quote
Old 10th January 2014, 12:49 PM   #6
diyAudio Member
 
Lazy Cat's Avatar
 
Join Date: Sep 2007
The task was to find a proper output inductor and test the amp to all possible values of capacitance as a load, to be sure there are no chances for the amp to oscillate, no matter what kind of speaker cable is connected to its output terminals.

Lowest possible output serial inductance to fulfill upper demands is 0,2 uH, very practical small size still to be located on PCB.

Few pictures attached as follows:

1. Plot of 10 kHz/20 Vpp square waves on 6 Ohm +1 uF load. Upper trace amp's output in front of inductor, lower trace behind the 0,2 uH inductor.

2. 32 ppm THD10k spectrum 20 Vrms on 6 Ohm load (60 Wrms/6 Ohm)

3. 24 ppm THD10k spectrum 20 Vrms on 6 Ohm + 1 uF (90 Wrms/4,3 Ohm impedance). We can see that 1 uF loading capacitor completely filtered out third harmonic and elevated the second for 5 dB. The whole THD droped for 8 ppm but since third harmonic is also present in the input signal, this THD reduction is actually bad, not preserving the input signal integrity.

4. 0,2 uH output inductor and 1 uF loading capacitor in series with on/off switch

5. Complete measuring assembly
Attached Images
File Type: jpg 12.jpg (611.8 KB, 312 views)
File Type: png 13.png (86.7 KB, 264 views)
File Type: png 14.png (87.0 KB, 144 views)
File Type: jpg 15.jpg (512.3 KB, 776 views)
File Type: jpg 16.jpg (464.6 KB, 778 views)
__________________
First One VSSA
  Reply With Quote
Old 10th January 2014, 12:52 PM   #7
diyAudio Member
 
Lazy Cat's Avatar
 
Join Date: Sep 2007
As a conclusion of the measurements here's 19+20 kHz intermodulation distortion measurement

1. 30 ppm THD19+20k 80 Vpp on 4 Ohm load

2. Setup
Attached Images
File Type: png 17.png (89.9 KB, 395 views)
File Type: jpg 18.jpg (402.9 KB, 329 views)
__________________
First One VSSA
  Reply With Quote
Old 10th January 2014, 01:04 PM   #8
chunek is offline chunek  Singapore
diyAudio Member
 
Join Date: Sep 2010
Location: Singapore
Hi LC,
Interested for a pair.

Thanks,
James
  Reply With Quote
Old 10th January 2014, 01:08 PM   #9
diyAudio Member
 
Lazy Cat's Avatar
 
Join Date: Sep 2007
Thanks chunek, you're the first one
__________________
First One VSSA
  Reply With Quote
Old 10th January 2014, 01:21 PM   #10
BigE is offline BigE  Canada
diyAudio Member
 
Join Date: Aug 2008
Location: Toronto
Class AB/D?
  Reply With Quote

Reply


Hide this!Advertise here!
Thread Tools Search this Thread
Search this Thread:

Advanced Search

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off


Similar Threads
Thread Thread Starter Forum Replies Last Post
800 Watt MOSFET Amplifier Module The Saint Aussie Amplifiers 75 18th July 2013 11:16 AM
MOSFET POWER AMPLIFIER MODULE IN EBAY INDIA reji Vendor's Bazaar 0 19th March 2013 01:52 AM
class D amplifier module,power amplifier module sunlight009 Vendor's Bazaar 2 19th October 2011 01:02 AM
NX400 - 400W RMS@4Ohms Lateral Mosfet Power Amplifier Module by Class-D for sale magnum_1 Swap Meet 16 13th June 2009 03:59 PM
Help with Mosfet module please Beejay Solid State 6 11th September 2008 03:21 PM


New To Site? Need Help?

All times are GMT. The time now is 01:40 AM.


vBulletin Optimisation provided by vB Optimise (Pro) - vBulletin Mods & Addons Copyright © 2014 DragonByte Technologies Ltd.
Copyright 1999-2014 diyAudio

Content Relevant URLs by vBSEO 3.3.2