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#12
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240v sounder
On Thu, 13 Mar 2008 23:46:46 GMT, wrote:
On 13 Mar, Frank Erskine wrote: Automatic light switches with an ORP12, a red spot transistor and a relay. And what about before semiconductors? Replace the red spot with a triode. Neon for the timer. Well yes - I didn't like to embarrass the youngsters (sub 58s, for example) on here... The relay has to be GPO 3000-type, with proper adjustments. -- Frank Erskine Be alert - the Country needs lerts. |
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