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Tauno Voipio wrote:
> Don wrote:
>> Oscar Toledo G. wrote:
>>> Hi there.
>>>
>>> I've developed an ISA board to test some transputer boards (TRAM) I bought in eBay,
>>> I started with a prototype wired board on an ISA development card, and then I made
>>> a proper PCB in three iterations as I solved some bugs.
>>>
>>> The ISA connector was just because I have several old PC motherboards (80286,
>>> 80486, a Pentium MMX, and a AMD K5)
>>>
>>> The history of development is available at
>>> https://nanochess.org/transputer_board.html
>>>
>>> The schematics and PCB are available at
>>> https://github.com/nanochess/transputer/pcb
>>>
>>> In the same git you can get my operating system developed in 1993-1996.
>>>
>>> Enjoy it!
>>
>> Great job!
>>
>> My agenda includes mastering kicad 9 - including its interface to
>> ngspice - as soon as possible. My passion these days is exploit Zynq
>> 7000 SoCs to virtualize both lab instruments and radios.
>>      Here's a sneak peek at my retro RF double balanced mixer work in
>> progess: <https://crcomp.net/mixer/> Although its hardware lash-up
>> was finished in no time, its webpage and rhetoric still need work.
>
> Don,
>
> You do need to use the center tap on TR2 to get anything
> but a sophisticated short circuit.

The schematic is a work in progress. Its 100 ohm load resistor is
missing along with terminators for the Local Oscillator and Radio
Frequency inputs and Intermediate Frequency output.
    Oscilloscope outputs from the ADAML2000 and a Tektronix now
appear at my webpage: <https://crcomp.net/mixer/> . The virtualized
scope does a good job of tracking its analog analog (so to speak).

The LTSpice simulation in AD's tutorial looks great. AD's practical
circuit, as shown in its tutorial, leans a little towards a
"sophisticated short circuit." Ergo, the motivation for my webpage.

Danke,

-- 
Don, KB7RPU, https://www.qsl.net/kb7rpu
There was a young lady named Bright Whose speed was far faster than light;
She set out one day In a relative way And returned on the previous night.

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