bear@obdient.CHI.IL.US (Harry Skelton) (03/28/89)
I have a kit "clock" that I purchased the other day but due to the unlisted design I was unaware that it required 12V AC rather than the 12V DC I was looking for. Is there a cheep conversion circut that will do the procesing? Is there a better "clock" project? I am looking for a simple clock for my car and a few more for other locations that are 12VDC environments. Also, I am looking for a 2SD707. I don't know who makes it but found a "compatable" part in a two legged can. I need the three legged flat pack type. (you can tell I'm a by-the-book begginer 8-) ). Many thanks from this humble novice...
wwg@brambo.UUCP (Warren W. Gay) (03/31/89)
In article <5545@obdient.CHI.IL.US> bear@obdient.CHI.IL.US (Harry Skelton) writes: >I have a kit "clock" that I purchased the other day but due to the >unlisted design I was unaware that it required 12V AC rather than the >12V DC I was looking for... Probably the only need for AC stems from the need for a 60 Hz (cycle) time base. It will likely run on 12VDC if applied in the correct places, but a "quick 'n dirty" would be a 555 timer to derive a 60 Hz signal for the clock input (I'm assuming you have a schematic). The 555 timer is truly the "dirty" way to do it-- but if its just for your car then it might be accurate enuf for the job. If you're prepared to do more work, I'm sure that others can provide you with directions for a crystal controlled time base. 73s de VE3WWG.
tindle@ms.uky.edu (Ken Tindle) (04/02/89)
In article <560@brambo.UUCP> wwg@brambo.UUCP (Warren W. Gay) writes: ]In article <5545@obdient.CHI.IL.US> bear@obdient.CHI.IL.US (Harry Skelton) writes: ]>I have a kit "clock" that I purchased the other day but due to the ]>unlisted design I was unaware that it required 12V AC rather than the ]>12V DC I was looking for... ] ]Probably the only need for AC stems from the need for a 60 Hz (cycle) ]time base. It will likely run on 12VDC if applied in the correct places, [...] ]If you're prepared to do more ]work, I'm sure that others can provide you with directions for a crystal ]controlled time base. Should be easy. A color burst crystal, a couple 22pF caps, and a MM5369 17-stage oscillator. Very accurate 60Hz just appears with this. Chip version EST produces 100Hz. --------------------------\ /------------------------------------------ INTERNET:tindle@ms.uky.edu | "I heard you." -Kirk BITNET:tindle@ukma.bitnet | "He simply could not believe his ears." Ken Tindle - Lexington, KY | -Spock, The Trouble With Tribbles --------------------------/ \------------------------------------------