On Sat, Jan 7, 2017 at 11:37 PM, Adrian Graham
wrote:
> Evening all,
>
> I wish I had the ability to take a board layout and turn it into a logically
> laid out schematic but as yet I don't. Video sync on my Executel 3910 is
> still running me round in circles so could one of you fine folk take a
On 08/01/2017 07:31, "Tony Duell" wrote:
> On Sat, Jan 7, 2017 at 11:37 PM, Adrian Graham
> wrote:
>> Evening all,
>>
>> I wish I had the ability to take a board layout and turn it into a logically
>> laid out schematic but as yet I don't. Video sync on my Executel 3910 is
>> still running me r
On 08/01/2017 07:31, "Tony Duell" wrote:
> On Sat, Jan 7, 2017 at 11:37 PM, Adrian Graham
> wrote:
>> Evening all,
>>
>> I wish I had the ability to take a board layout and turn it into a logically
>> laid out schematic but as yet I don't. Video sync on my Executel 3910 is
>> still running me r
On Sun, Jan 8, 2017 at 11:10 AM, Adrian Graham
wrote:
> On 08/01/2017 07:31, "Tony Duell" wrote:
>> I don't believe it's correct as drawn. For one thing you have V333, an NPN
>> transistor, with the collector grounded (and no -ve supplies on the circuit.
>> For
>> another, R322 is ridiculously l
On Sun, Jan 8, 2017 at 2:00 PM, Adrian Graham
wrote:
> You were right, I'd drawn out R335 wrongly and flipped V333. All the anodes
> go via R312 to the collector of V333 along with R309-R311. Base for V333 is
> the inverted sync output of the MR9735. R322 is 6.8k
> (blue-grey-black-brown). All di
>>> http://www.binarydinosaurs.co.uk/STCExecutelSyncCircuit.jpg
>> I don't believe it's correct as drawn. For one thing you have V333,
>> an NPN transistor, with the collector grounded (and no -ve supplies
>> on the circuit.
Bipolar transistors are to some extent symmetric under interchange of
co
On Sun, Jan 8, 2017 at 4:18 PM, Mouse wrote:
> I also question the way R311/R310/R309 are all different. I would
> expect the red, green, and blue circuits to be electrically more or
> less identical, and different pulldown values does not fit with that.
Well, I wonder if it's producing a weigh
On 08/01/2017 14:06, "Tony Duell" wrote:
> On Sun, Jan 8, 2017 at 2:00 PM, Adrian Graham
> wrote:
>
>> You were right, I'd drawn out R335 wrongly and flipped V333. All the anodes
>> go via R312 to the collector of V333 along with R309-R311. Base for V333 is
>> the inverted sync output of the MR
On 08/01/2017 16:18, "Mouse" wrote:
http://www.binarydinosaurs.co.uk/STCExecutelSyncCircuit.jpg
>>> I don't believe it's correct as drawn. For one thing you have V333,
>>> an NPN transistor, with the collector grounded (and no -ve supplies
>>> on the circuit.
>
> Bipolar transistors are to
> I photographed both sides of the board and merged the pictures together to
> make a front/back composite. The trace for the cathodes of the 3 diodes
> links together on the back of the board and doesn't go anywhere else. The
> front trace from V302 cathode goes straight to R312. The anodes DO lin
On 08/01/2017 17:21, "Tony Duell" wrote:
>> I photographed both sides of the board and merged the pictures together to
>> make a front/back composite. The trace for the cathodes of the 3 diodes
>> links together on the back of the board and doesn't go anywhere else. The
>> front trace from V302 c
On Sun, Jan 8, 2017 at 6:11 PM, Adrian Graham
wrote:
> On 08/01/2017 17:21, "Tony Duell" wrote:
>
>>> I photographed both sides of the board and merged the pictures together to
>>> make a front/back composite. The trace for the cathodes of the 3 diodes
>>> links together on the back of the board
On 08/01/2017 18:20, "Tony Duell" wrote:
>> However, two of us bought units at the same time and the other one has a
>> little bridgeboard containing a 74LS244 that sends the RGB signals to a DIN
>> socket on the back of the case for an external monitor. I also can't see a
>
> And in a sense the
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