| ??? 05/17/04 23:09 Read: times |
#70557 - Historical Images Responding to: ???'s previous message |
I said:
I have before me a copy of the Mullard Reference Manual of Transistor Circuits, 1st Edition, 1960; it is full of "upside-down" schematics, PNP germanium transistors Here are some examples (note the negative supply at the top): 
 See also: http://www.8052.com/forum/read.phtml?id=61123 I also have a Mullard's electronic Counting - Circuits, Techniques, Devices, 1967; by then, they were using silicon transistors in NPN polarity, and drawing their circuits the "right" way up: 
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