Page 10 of Clock Electronic Electronic Circuits

Clock Circuits
Clocks: #-A B-C D-G H-O P-S T-Z

Last Updated on: Wednesday, June 02, 2021 04:22 AM

Circuits Designed by Dave Johnson, P.E. :

Motorized Duck Decoy Timer - I received a nice email from a duck hunter. He uses some motorized decoys to lure ducks into his line of fire. However, the battery powered decoys only have an on/off switch so once turned on; the decoy flaps its wings or paddles around continuously. The hunter wanted a more realistic motion, which would power the motor for say 10 seconds, then stop for another 10 seconds before starting up again. The simple circuit below should work well for his application . . . [Hobby Circuit designed by David Johnson P.E., 09/04/11]
On/Off Flip/Flop Circuit With Automatic Timeout - This circuit is ideal when a device needs to be turned on and off with a single pushbutton switch, but also needs to turn itself off after some period of time. With the components shown, the output will stay on for only about 20 seconds . . . [Circuit by David A. Johnson P.E., 05/01/12]
On/off Pushbutton Switch with 30 Minute Timeout - I received an email from a Discover Circuits visitor. He wanted to control power to a LED camping light he was building. He wanted to turn the light on and off with a small pushbutton switch. He also wanted a timer so the light would not stay on longer than 30 minutes at a time. It seems that his kids often turned lights on when going to bed and then forgot to turn them off . . . [Circuit by David Johnson P.E., 01/08/12]

Links to electronic circuits, electronic schematics and designs for engineers, hobbyists, students & inventors:

Mechanical Wall Clock Quartz Synchronizer - The synchronizing circuit that produces a short magnetic pulse to keep the pendulum in near perfect time was made using a crystal oscillator and binary counters to generate a 60mS pulse at the required rate of
53. 4241 PPM. I didn't know the exact rate, but it appeared . . . [Bill Bowden's design]

Modeller’s Clock - The special feature of this analogue wall clock is that it uses a standard model servo to tell the time. The display principle is the same as for an ordinary wall clock, but with two important differences. A standard model servo is unable to cover a travel of 360°, so we’ll need to adapt the clock face to this situationmust register on this site. . . [Published in Elecktor July/Augu, 2010]

Morse Beacon - The Morse beacon can be programmed with a short sentence or phrase, which is then retained in non-volatile memory and subsequently keyed out automatically in a repeating fashion as might be done to advertise a callsign, etc. . . . [Karen's Microprocessor Projects]

Morse Code Alarm Clock Modification - (Almost) Trivial application of an AT90S2313 or ATtiny2313 in an alarm clock to change the alarm from "BEEP BEEP BEEP BEEP BEEP BEEP BEEP BEEP" to "WAKE UP" in Morse code. This was designed in response to a request and is in daily use. . . [From Dick Cappels' project pages]

Motorized Duck Decoy Timer - I received a nice email from a duck hunter. He uses some motorized decoys to lure ducks into his line of fire. However, the battery powered decoys only have an on/off switch so once turned on; the decoy flaps its wings or paddles around continuously. The hunter wanted a more realistic motion, which would power the motor for say 10 seconds, then stop for another 10 seconds before starting up again. The simple circuit below should work well for his application . . . [Hobby Circuit designed by David Johnson P.E., 09/04/11]

Nixie-Tube Clock - This is a my nixie-tube clock built 8 years ago. . . . [The Electronic Lives Manufacturing-presented by Chan]

On/Off Flip/Flop Circuit With Automatic Timeout - This circuit is ideal when a device needs to be turned on and off with a single pushbutton switch, but also needs to turn itself off after some period of time. With the components shown, the output will stay on for only about 20 seconds . . . [Circuit by David A. Johnson P.E., 05/01/12]

On/off Pushbutton Switch with 30 Minute Timeout - I received an email from a Discover Circuits visitor. He wanted to control power to a LED camping light he was building. He wanted to turn the light on and off with a small pushbutton switch. He also wanted a timer so the light would not stay on longer than 30 minutes at a time. It seems that his kids often turned lights on when going to bed and then forgot to turn them off . . . [Circuit by David Johnson P.E., 01/08/12]

Oscilloscope CRT Clock - Apparently I'm in the shameful habit of making clocks in my spare time. First it was the Weston voltmeter clock, and then "Nixie 1, " a single-digit Nixie clock. Since soon after finishing the latter, I've been daydreaming about making a clock out of an electrostatic deflection CRT—the kind of thing you find in an oscilloscope. Given that I've just come across some free time in the form of Christmas vacation 2005, I decided to make one of my own. . . [© 2007 by Riad S. Wah[by]

<<<< Previous PAGE Next >>>>

Clocks: #-A B-C D-G H-O P-S T-Z