GB for Leach Low-TIM with 8 + 8 BJT outputs (bare PCB) - diyAudio
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Old 17th February 2014, 07:35 AM   #1
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Default GB for Leach Low-TIM with 8 + 8 BJT outputs (bare PCB)

Folks, as the title says: This is a preliminary GB for a Leach Low-TIM clone based on Jens Rasmussen's last published schematic, with 2 additional output pairs for better SOAR management (and a few other minor modifications). Almost all the parts designations have been retained the same as the Jens Rasmussen BOM. With 8 + 8 2STC5200/A1943 outputs and +/- 75V rails, this should comfortably manage about 300W into 8 ohms. Higher rails are possible with appropriate transistor substitutions. Each of these boards is a monoblock of dimensions 265mm x 95mm (see attached picture).

At the moment, I have 16 boards available, but depending on the interest, I can order additional boards (for further rounds of the GB) with about 2 weeks lead time.

The bare boards are priced at USD 18 each, and I can ship up to 4 boards to most locations in the US/EU/Australasia for a flat rate of USD 8.

If interested, please add the quantity required to the thread, and PM me your email address. PM or email me (siva dot chander at gmail dot com) for questions, clarifications, details, etc.
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Old 17th February 2014, 07:59 AM   #2
AJT is offline AJT  Philippines
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hi, what is the size of the boards? are they 1 oz types? thanks...
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Old 17th February 2014, 08:04 AM   #3
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Quote:
Originally Posted by AJT View Post
hi, what is the size of the boards? are they 1 oz types? thanks...
They're 265mm x 95mm with Cu thickness of 70 microns (2 oz.). I forgot to mention that there's a jumper for an optional ThermalTrak-style 3- or 4-diode chain for the Vbe multiplier. The diode chain can be mounted on a small piece of vero or perfboard and kept in close thermal contact with the heatsink, and the two ends of the chain are connected to the jumper. Alternatively, the diode chain can be omitted and the jumper shorted.

Last edited by linuxguru; 17th February 2014 at 08:17 AM. Reason: addendum
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Old 17th February 2014, 08:40 AM   #4
Johno is offline Johno  Australia
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I am in for 2 bare boards.

Thanks
John
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Old 17th February 2014, 07:52 PM   #5
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Default Put me down for four bare PCB's

Add me to the list, I want four bare PCB's. Take care
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Old 18th February 2014, 12:51 AM   #6
Junm is offline Junm  Philippines
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how much for two PCB including shipping?
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Old 18th February 2014, 05:09 AM   #7
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Quote:
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how much for two PCB including shipping?
To the Philippines (?): 2 x 18 + 8 (s&h) + 1 (paypal fees) = USD 45 total.
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Old 18th February 2014, 08:00 AM   #8
AJT is offline AJT  Philippines
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how many boards are up for grabs?
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Old 18th February 2014, 08:49 AM   #9
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Quote:
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how many boards are up for grabs?
6 spoken for, 10 uncommitted as of now. Beyond 16, I'll probably have to batch the re-orders in lots to get a decent price break - at the moment, that minimum batch size looks to be 20, but smaller batches are possible (as few as 10 are feasible at higher prices).
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Old 18th February 2014, 08:54 AM   #10
AJT is offline AJT  Philippines
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i suggest that you post the price breaks so that more people may be enticed to join....
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