|
|||||||
| Home | Forums | Rules | Articles | Store | Gallery | Blogs | Register | Donations | FAQ | Calendar | Search | Today's Posts | Mark Forums Read | Search |
| Siliconray Online Electronics Store Amplifier boards, HiFi components, tubes and all kinds of electronics for the DIYer from Siliconray |
  |
|
|
|
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 |
 |
|
|
Thread Tools | Search this Thread |
17th November 2011, 09:34 AM
|
#1 |
|
diyAudio Member
Join Date: Sep 2011
|
★★ Free PCB for JLH 2005 Class-A Amplifier
We are offering free PCB for JLH 2005 class-A amplifier
Please get it here: Free JLH-2005 Class-A Amplifier PCB Each order is limited to 2pcs. If you don't have the components please go with this cheap kit: JLH-2005 Class-A Amplifier Kit for only $24
__________________
www.siliconray.com High Quality Audio Enclosures, Amp Kits, Amplifiers, PCB Fab Services Chat with me |
|
|
17th November 2011, 10:17 AM
|
#2 |
|
diyAudio Member
Join Date: May 2009
Location: Riga, LV
|
Two boards ordered - I have always wanted to try JLH. tnx
|
|
|
|
17th November 2011, 11:57 AM
|
#3 |
|
diyAudio Member
Join Date: Sep 2011
|
Hi Oscar
Thanks for ordered. I saw 5 orders in the past hour. Are you from Latvia? I'm not sure wether the flat rate shipping service is available for your country. I will ask the courier about it tomorrow.
__________________
www.siliconray.com High Quality Audio Enclosures, Amp Kits, Amplifiers, PCB Fab Services Chat with me |
|
|
|
17th November 2011, 11:58 AM
|
#4 |
|
diyAudio Member
Join Date: May 2009
Location: Riga, LV
|
ok, thnaks. Yes im from LV.
|
|
|
|
19th November 2011, 10:53 PM
|
#5 |
|
diyAudio Member
Join Date: Sep 2011
|
First bath was sold out. The second batch will be made after the first design is tested. Keep on offering free PCB!
__________________
www.siliconray.com High Quality Audio Enclosures, Amp Kits, Amplifiers, PCB Fab Services Chat with me |
|
|
|
21st November 2011, 04:27 AM
|
#6 |
|
diyAudio Member
Join Date: Sep 2011
|
Fab out!
Begin to ship today, first 25 orders will be shipped soon. Later orders will be shipped a few days later.
__________________
www.siliconray.com High Quality Audio Enclosures, Amp Kits, Amplifiers, PCB Fab Services Chat with me |
|
|
|
23rd November 2011, 09:29 AM
|
#7 |
|
diyAudio Member
Join Date: Sep 2011
|
Happy with the testing reslut!
Today I'm sooooo happy with the testing result. After the following modifications of the original first design I posted:
1. VR1 changed to 100R 2. R13 changed to 10R 3. Q3 changed to BD139 The amplifier is working great! At the beginning the THD is 1% @1KHz/1W/8Ohm, pretty high for a class-A. I realize that Q1 and Q2 should be paired matched. Then I changed them with 2 pair matched transistors, the THD drops to 0.05%! I also tried with some other transistors such as 2N3055, 2N3773 and finally 2SC5200. In my own opinion I like the sound of 2SC3280 most, high freq is very clear. BD139 and BD140 works great in the testing. I think it's no need to worry about the high current. The don't have a heatsink and were slightly warm during working. Hope your guys can also build a great amplifier when you receive my free PCBs.
__________________
www.siliconray.com High Quality Audio Enclosures, Amp Kits, Amplifiers, PCB Fab Services Chat with me |
|
|
|
24th November 2011, 09:20 AM
|
#8 |
|
diyAudio Member
Join Date: Sep 2011
|
Bug and testing report
Sorry for forgetting to mention a bug on the board. A trace is missing on the fist version, the 2 collectors of Q3 and Q8 are not connected. A flying wire can solve this easily
Tested THD with different transistors, testing condition is 1KHz, 6Ohm speaker, 1W output power 2N3055: 0.06% MJ15003: 0.03% 2SC3280: 0.03% MJ15003 and 2SC3280 should be better options for Q1 and Q2
__________________
www.siliconray.com High Quality Audio Enclosures, Amp Kits, Amplifiers, PCB Fab Services Chat with me |
|
|
|
| Currently Active Users Viewing This Thread: 1 (0 members and 1 guests) | |
| Thread Tools | Search this Thread |
|
|
Similar Threads
|
||||
| Thread | Thread Starter | Forum | Replies | Last Post |
| My JLH-2005 | siliconray | Solid State | 4 | 14th November 2011 10:51 AM |
| PCB for JLH Class A Amplifier | Akita | Swap Meet | 1 | 11th October 2011 04:10 AM |
| ★BR Bookshelf Cabinets for Mark Audio CHR-70, Special Price:$65/pair only | Musik007 | Twin Audio | 90 | 17th September 2011 04:59 PM |
| ★Plywood bookshelf cabinets for CHR-70, Special Price: US$60/pair only | Musik007 | Twin Audio | 50 | 23rd August 2011 02:10 PM |
| Wanted JLH Class A Phone Amp Pcb overlay | colin.hepburn2 | Solid State | 2 | 21st February 2003 08:48 PM |
| New To Site? | Need Help? |
| Page generated in 0.09849 seconds (79.01% PHP - 20.99% MySQL) with 11 queries |
