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Audio and Video Talk
Reel-to-Reel & Cassette Tapes
Flat faced Revox B77 conversion
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<blockquote data-quote="marcochezzi" data-source="post: 993503" data-attributes="member: 21001"><p>Thanks Den, must admit I had a respectful chuckle when I read your ?what chip? question, yes nowadays you can easily make this out of one chip and a good bit of programming, problem is I know jack about programming... </p><p></p><p>No, some 30 years ago I drew up this design for my RS-1500, and it is all discrete cmos, so 1 bcd up down counter + 1 bcd to 7 seg driver per individual 7 segment element, plus a ton of gating to control count to 5 on the tens for hrs minutes & seconds where units go to nines, more gating to load numbers differently for up & down count direction, jk flip flops for the quad encoder, some dividers to get to 1hz pulse....</p><p></p><p>Must admit, it?s a hell of a circuit, took a lot of thinking and still has one gremlin a I cannot seem to completely iron out, completely obsolete, just like my machines, but works, just like my machines..!! :clap:</p><p></p><p>But, one day, I might just figure out this programming thing...</p></blockquote><p></p>
[QUOTE="marcochezzi, post: 993503, member: 21001"] Thanks Den, must admit I had a respectful chuckle when I read your ?what chip? question, yes nowadays you can easily make this out of one chip and a good bit of programming, problem is I know jack about programming... No, some 30 years ago I drew up this design for my RS-1500, and it is all discrete cmos, so 1 bcd up down counter + 1 bcd to 7 seg driver per individual 7 segment element, plus a ton of gating to control count to 5 on the tens for hrs minutes & seconds where units go to nines, more gating to load numbers differently for up & down count direction, jk flip flops for the quad encoder, some dividers to get to 1hz pulse.... Must admit, it?s a hell of a circuit, took a lot of thinking and still has one gremlin a I cannot seem to completely iron out, completely obsolete, just like my machines, but works, just like my machines..!! :clap: But, one day, I might just figure out this programming thing... [/QUOTE]
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Audio and Video Talk
Reel-to-Reel & Cassette Tapes
Flat faced Revox B77 conversion
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