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From: Joerg <news@analogconsultants.com>
Newsgroups: sci.electronics.design
Subject: Re: Fast sampler
Date: Thu, 6 Mar 2025 15:38:19 -0800
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On 3/6/25 3:04 PM, john larkin wrote:
> On Thu, 6 Mar 2025 14:12:14 -0800, Joerg <news@analogconsultants.com>
> wrote:
> 
>> On 3/6/25 12:51 PM, john larkin wrote:
>>> On Thu, 6 Mar 2025 12:33:35 -0800, Joerg <news@analogconsultants.com>
>>> wrote:
>>>
>>>> On 3/6/25 8:29 AM, Bill Sloman wrote:

[...]


>>>>> And what's Standard ECL now? It was Motorola 10k back when I was young,
>>>>> and Motorola/Philips/Fairchild 100k a few years later. Motorola ECLinPs
>>>>> took over a about when I stopped using it, about when I started posting
>>>>> here, some twenty years ago.
>>>>>
>>>>
>>>> AFAIK it's 100E but I have not used any in ages because I always found
>>>> them overpriced. I don't like it when two ICs cost more than a crate of
>>>> beer :-)
>>>
>>> MC10EPxx, SiGe Eclips Lite.
>>>
>>> Really fast and really expensive is Gigacomm, which is actually CML.
>>> The NB7V52M flop is only about $13 in quantity.
>>>
>>
>> So far I've only needed "semi-analog", meaning just one bit and then I
>> did it using RF transistors. It is amazing, you can buy >100GHz fT for
>> less than 20 cents in qties.
>>
>> When I was a kid I had to shell out around $3 for an AF116 Ge-transistor
>> that had an fT of 75MHz. In 1970's Dollars, which really hurt. Digital
>> wasn't any better. I needed a 1kbit RAM for a project and that set me
>> back about 10 bucks. It still works.
> 
> My first transistor was a Raytheon CK722 germanium. I think Ft was
> measured in KHz. It cost $7, about a month's allowance, or dinner for
> two at a decent restaurant.
> 

Now you've revealed your age bracket :-)

I salvaged some German OC-series Ge-transistors out of discarded gear.

https://www.cedist.com/products/transistor-oc45-valvo-germanium-so-2-glass-case-pnp

You could scrape off the black paint and clear glass showed up, with the 
bare transistor inside. That way I had free opto-transistors that could 
be used for really cool stuff. LDRs were very expensive over there so 
that helped a lot.


> I got tubes for free.
> 

Same here. In Germany we had regular bulk waste days where people placed 
their non-working TV sets and similar large items at the curb for 
pickup. I carted a lot of that home, all on the baggage rack of my 
bicycle. Some TVs I repaired, others I used for scavenging. 
Unfortunately the German ones had a suicide chassis (hot) and the tube 
filaments were all in series. 300mA but the voltages varied widely. So I 
had to rewind transformers for the filaments. Finding old radios brought 
easier tubes with 6.3V filaments but that also meant a fierce scavenger 
competition. Who ever got up earlier or had a faster bike won.

-- 
Regards, Joerg

http://www.analogconsultants.com/