[mythtv-users] CIR... Where to purchase? (also an aside re DC SdCv)

Simon Paterson simon.paterson.nz at gmail.com
Wed Mar 5 09:38:20 UTC 2014

On Tue, 4 Mar 2014 07:37:49 -0600 Leif Pihl <leif at pihl.us> wrote:
>> Gents:
>> I have an Intel DH77KC motherboard, equipped with C.I.R. (Consumer
>> Infra Red). The connections are illustrated at labels "S" and "T" in
>> the diagram shown at this URL:
>> http://www.intel.com/support/motherboards/desktop/dh77kc/sb/CS-033204.htm
>> The "T" connector MAY have five pins,  and  the "S" connector does
>> have seven pins.
Hi Leif,

About 18 months ago, I purchased a receiver (for a previous generation 
Intel DH67CF mobo, but same specs) from 

Now, unfortunately, I just visited that site to confirm it was the 
correct one, and there is now a message there saying that they've sold 
out of the CIR receiver modules, and won't be making any more.

At the time I was looking, they were the only supplier I could find of 
receiver modules for motherboard CIR. I never noticed anyone selling 
transmitter / emitter modules, but as my FE doesn't need one, I didn't 
look that hard.

On 05/03/14 11:10, Mike Thomas wrote:
> Without reading the Microsoft specification it is unclear whether an
> ordinary photodiode will do, so unless you're adept at designing your
> own pre-amp for your photodiode,
For reasons too stupid to mention, the module is not inside the FE 
machine at the moment, so I just had a look at it. It looks identical 
(and probably is except for the mobo end cable pinout) to the one still 
pictured on the inteset site for asrock mobos.
It is centered around a LM393 'Dual Differential Comparator' 
http://www.ti.com/product/lm393 , along with 10 resistors, 4 capacitors, 
the actual IR receiver, and also an indicator led, and another different 
IR receiver for learning.

Hopefully that gives you some idea if you want to build your own. I'll 
probably go ahead and trace out the circuit for my own interest anyway, 
as this mention of it has reminded me that I need to get it back working 
in the FE.


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