iONic
Member
I built this circuit (clock with alarm and timer). Everything seems to work well except that it runs fast, very fast...several hours in just 1 day. At first I rechecked all components and they seemed good, checking every diode as they seem to blow easily if not heatsinked well. All was well. Then after reading the
Datasheet for the LM8560 I thought I had found the problem... did I have J1 (Jumper 1) connected for 50Hz operation and not 60Hz operation. Nope! This was ok too! Now I am stumped as to why it runs so fast.
Anyone have any ideas/suggestions?
Schematic:
www.bakpakr.com/downloads/clock.jpg
Datasheet:
www.bakpakr.com/downloads/LM8560.pdf
Thanks
Datasheet for the LM8560 I thought I had found the problem... did I have J1 (Jumper 1) connected for 50Hz operation and not 60Hz operation. Nope! This was ok too! Now I am stumped as to why it runs so fast.
Anyone have any ideas/suggestions?
Schematic:
www.bakpakr.com/downloads/clock.jpg
Datasheet:
www.bakpakr.com/downloads/LM8560.pdf
Thanks
Last edited: