On Fri, Feb 14, 2025 at 08:33 AM, Martin - Southwest UK wrote:
It always used to amuse me when dealing with one particular make of broadcast transmitter, where individual sections had obviously been designed by graduate engineers, and the feedback around operational amplifier stages used non-standard value, 1% tolerance parts, even though they were intended to be simple, unity gain buffer stages.
This example is more about the cost optimization, which is another side of the real life engineering. It applies to hobby projects as well. A hobby design becomes popular only when it balances the performance with cost (and availability of parts). LZ1AQ loop amp is a nice example. But suggesting 2SC1815 for use in it is a step too far in the cost reduction direction :)
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73, Mike AF7KR
