[time-nuts] ks... answers The emails are getting long

Bob Camp kb8tq at n1k.org
Thu Nov 20 07:04:05 EST 2014


Hi

As I recall, the whole LH series was a multi chip rather than monolithic IC approach. Even back in the day, that made them expensive parts. There are other parts that make fine 10 MHz buffers that only cost a dime.

Bob

> On Nov 19, 2014, at 9:00 PM, Jim Lux <jimlux at earthlink.net> wrote:
> 
> On 11/19/14, 3:59 PM, Dave Daniel wrote:
>> I remember the "Fast and Damn Fast Buffer Amp" data sheet. LH0036? I may
>> not be remembering the correct part number.  I used to have a copy of
>> that data sheet, as well as another that was labeled "DC to Daylight" on
>> the data sheet.
>> 
>> DaveD
>> 
>> On 11/19/2014 2:42 PM, Mike Feher wrote:
>>> Hi Doug -
>>> 
>>> Wow. Wonder how many on here remember or know about National's "Damn
>>> Fast" line, HI. I used them all the time, and, still have a few. 73 -
>>> Mike
>>> 
> 
> In the 1984 databook (Blue cover with the yellowing fragile newsprint pages) and in the 1975 databook (yellow and green cover, nice quality paper). LH0033 and LH0063 are the Fast and Damn Fast buffer amplifiers.  In this context the data sheet says 6000V/microsecond.  With +/- 10V into a 50 ohm load (although you only get 2400 V/us there)
> 
> Last two pages in the 84 book are just blank. Last page in the 75 book is a description of MIL-STD-883B
> 
> Interesting parts.. They aren't kidding when they say you need good power supply bypassing and decoupling.(a comment that is in the 84 book but not the 75 version) I'm trying to remember what I was using them for: driving a YIG tuning coil in a phase locked loop, I think, but it might have been driving a fast RF switch.
> 
> 
> Interesting parts back then.. Does anyone still make or use a LM746 "chroma demodulator" (other than as a replacement part) or any of the other very purpose specific parts for parts of a TV? (like LM1845 signal processing, etc.)
> 
> 
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