I'm still waiting for a schematic of the Lundahl LL1545A (new Rowland amp) implementation from analogdiy.
This is my part list for your reference :
Parts Quantity
Case, DRV134 kit x2
500VA Transformer x2
47000uF RIFA Caps x4
Heatsink x4
47k 1% x4
10k 0.1% x12
200k 0.1% x12
8pF x12
220pF x12
2200uF 63V Muse x16
0.1uF Wima x28
Dale 0.2ohm 3W SMD x12
LM3886 x12
2ohm 1W x4
Solen 10uF x4
VR 50k x12
3pin connector x 8
2pin connector x4
small 2 pin conn x4
Thermal Pad x12
Parts Quantity
Case, DRV134 kit x2
500VA Transformer x2
47000uF RIFA Caps x4
Heatsink x4
47k 1% x4
10k 0.1% x12
200k 0.1% x12
8pF x12
220pF x12
2200uF 63V Muse x16
0.1uF Wima x28
Dale 0.2ohm 3W SMD x12
LM3886 x12
2ohm 1W x4
Solen 10uF x4
VR 50k x12
3pin connector x 8
2pin connector x4
small 2 pin conn x4
Thermal Pad x12
That is helpful but I think Hipcheck was working on a group-buy of the same parts for everyone. Has that been continued any further?
To Diyaudio members who confirmed the order :
The PA150 3x3886 PCBs are ready. Please email me with the following information and I will prepare the package and send you a paypal invoice.
- Number of PCBs you want to buy
- Shipment method (Registered Air Mail or HK Speedpost)
- Delivery Address
- Recipient name for the delivery
- Your Paypal account id (email)
If I receive your paypal payment on or before Saturday. I will mail it out on Monday (June 4th)
==========================
Shipping Info (to US) :
Shipping weight : 40g per PCB. Packing is about 150g.
Hong Kong Post Registered Air mail
- estimated 2-4 weeks delivery (+ customs clearance time if any)
- 1-4 PCBs at USD 7
- 5-6 PCBs at USD 7.5
- 7-8 PCBs at USD 9
- 9-10 PCBs at USD 10
Hong Kong Speedpost
- estimated 2-4 days delivery (+ customs clearance time if any)
- 1-9 PCBs at USD 15.5
- 10-20 PCBs at USD 21
The PA150 3x3886 PCBs are ready. Please email me with the following information and I will prepare the package and send you a paypal invoice.
- Number of PCBs you want to buy
- Shipment method (Registered Air Mail or HK Speedpost)
- Delivery Address
- Recipient name for the delivery
- Your Paypal account id (email)
If I receive your paypal payment on or before Saturday. I will mail it out on Monday (June 4th)
==========================
Shipping Info (to US) :
Shipping weight : 40g per PCB. Packing is about 150g.
Hong Kong Post Registered Air mail
- estimated 2-4 weeks delivery (+ customs clearance time if any)
- 1-4 PCBs at USD 7
- 5-6 PCBs at USD 7.5
- 7-8 PCBs at USD 9
- 9-10 PCBs at USD 10
Hong Kong Speedpost
- estimated 2-4 days delivery (+ customs clearance time if any)
- 1-9 PCBs at USD 15.5
- 10-20 PCBs at USD 21
Invoice information
All requested info sent to you via e-mail.
Thanks for your effort!
Cheers,
LS
All requested info sent to you via e-mail.
Thanks for your effort!
Cheers,
LS
Rowland Implementation
Sorry for the late reply, I have been out of town. I have tried to attached the pdf file but the website keeps on telling me the file size is too big. I'll try to shrink it later tonight. Anyways, similar information can be found on Analog's AD815 datasheet, page 13/14
In order to run full balanced topology as in Coherence preamp, you'll need 2 Jensen transformers per channel and the costs add up fast. The newer Rowland preamp/amp use only 1 transformer to achieve full balanced operation.
If there are enough people interested in using the transformer to drive balanced BPA-300 board, I will e-mail AlexW88 the schematic (provided he doesn't mind and has time to play with the topology) and see where we can go from there.
Any words on the parts?
Sorry for the late reply, I have been out of town. I have tried to attached the pdf file but the website keeps on telling me the file size is too big. I'll try to shrink it later tonight. Anyways, similar information can be found on Analog's AD815 datasheet, page 13/14
In order to run full balanced topology as in Coherence preamp, you'll need 2 Jensen transformers per channel and the costs add up fast. The newer Rowland preamp/amp use only 1 transformer to achieve full balanced operation.
If there are enough people interested in using the transformer to drive balanced BPA-300 board, I will e-mail AlexW88 the schematic (provided he doesn't mind and has time to play with the topology) and see where we can go from there.
Any words on the parts?
alex88 bpa300
who makes a truly stable variable resistor which we can use in this setup to adjust dc offset. it is a particularly close tolerance adjustment and long term reliablility would be nice. a group buy on the jensen transformers would be what 50-60 u.s. dollars apiece?????
who makes a truly stable variable resistor which we can use in this setup to adjust dc offset. it is a particularly close tolerance adjustment and long term reliablility would be nice. a group buy on the jensen transformers would be what 50-60 u.s. dollars apiece?????
Is the balanced schematic simple or complex? I wonder if I can just use one Lundahl 1545a per channel without using any other parts, as in http://www.lundahl.se/pdfs/datash/1545a.pdf
Here is a parts list with Farnell parts number. Hopefully it helps you to search for parts.
http://www.shine7.com/audio/PA150-BOM.xls
Here is a parts list with Farnell parts number. Hopefully it helps you to search for parts.
http://www.shine7.com/audio/PA150-BOM.xls
Rowland uses LL1545A in the later amps to cut the tranformer cost down. Also, Rowland uses DC Servo to eliminate dc offsets.
rowland lm3886
does anyone know the transformer specs on the rowland lm3886 amps. high va amps in 25 volt range are all custom designs in the hunting i have been doing. 625va is about the max at this voltage.
does anyone know the transformer specs on the rowland lm3886 amps. high va amps in 25 volt range are all custom designs in the hunting i have been doing. 625va is about the max at this voltage.
Good call. I have some EI cores I was going to use but toroids are better. Let us know if you find some.
Alex,
If it's not too late I'd like to get 4 boards. Pls let me know if you have 4 available.
Thx
Mike
If it's not too late I'd like to get 4 boards. Pls let me know if you have 4 available.
Thx
Mike
Re: alex88 bpa300
The bridged is theoretically twice as sensitive but, since both amps are likely to drift in the same direction as temps vary, then I suspect it may turn out that overall it is less sensitive.
A normal sealed multiturn is adequate.
the parallel set up is no worse than any other in output offset sensitivity.tryonziess said:
The bridged is theoretically twice as sensitive but, since both amps are likely to drift in the same direction as temps vary, then I suspect it may turn out that overall it is less sensitive.
A normal sealed multiturn is adequate.
I have written a PA150 assembly guide and tips for anyone who is interested :
http://shine7.com/audio/pa150.htm
http://shine7.com/audio/pa150.htm
alex88 bpa300
there was a thread somewhere about a das modul amp. he used lm3886 chips which laid parallel to the pcb. anyone know what case style number that is. it would be great on alex88 pcb to lay the whole board against the sink with spacers. nice neat setup and efficient.
there was a thread somewhere about a das modul amp. he used lm3886 chips which laid parallel to the pcb. anyone know what case style number that is. it would be great on alex88 pcb to lay the whole board against the sink with spacers. nice neat setup and efficient.
Re: alex88 bpa300
Those were just regular LM3886 with the pins bent so it would lay flat.
tryonziess said:there was a thread somewhere about a das modul amp. he used lm3886 chips which laid parallel to the pcb. anyone know what case style number that is. it would be great on alex88 pcb to lay the whole board against the sink with spacers. nice neat setup and efficient.
Those were just regular LM3886 with the pins bent so it would lay flat.
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