Readme.txt - ajacobs - 2/22/09
adam at jacobs dot us
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These are just a few notes intended to aid in construction of this clock.

Features:
- 6 digit Multiplexed design, requiring only a single 74141
- Alarm clock with snooze
- low-cost, small footprint, in-circuit programmable microcontroller
- low power consumption, due to multiplexed display (less than 100ma at 12vdc)
- Safe, sturdy, low cost high voltage supply, designed by Mike Moorrees and shamelessly cribbed from him in its entirety, unaltered.

 Notes when constructing the power supply sections:
- The 7805 does not require heatsinking, power dissipation is less than .2 watt
- Switching supply component selection is extremely important:
	L2 - Mouser 580-1422435C, 580-18R224C, or 807-4590R-224K
	C14 - 250v rated. Mouser 140-XRL250V1.0-RC
	C12 - Low ESR type, Mouser 647-UHE1E221MPD, or 647-UHE1C331MPD
	Q9 - IRF630, IRF730, IRF740, TX137 are all acceptable



 Notes regarding the microcontroller selection and programming:
- Included in this zip file are source code as well as hex file ready for programming to an Atmel ATTiny2313 microcontroller. This design/source does not support the ATTiny2313V in its current form. 
- After successfully programming the ATTiny2313, you will need to set the fuse bits properly. the lower fuse bits should be set to 0xff. - NOTE: After setting the lower fuse bits to 0xff, the ATTiny2313 will no longer respond unless/until the external oscillator is connected.
- 10-pin header included in the schematic complies to standard 10-pin AVR pinout for in-circuit programming.


Full Mouser BOM for project (does not include nixies, enclosure or veroboard. Does include switches, wall-wart supply, 74141, optional pin-header for in-circuit programming) Total cost about $30. 

512-1N914 1
649-DILB8P223TLF 1
511-MC34063ECN 1
512-IRF740B 1
594-D103Z25Z5VF63L6R 1
80-C315C102M1U 1
512-MPSA55 1
821-MUR160 1
647-UHE1E221MPD 1
140-XRL250V1.0-RC 1
580-18R224C 1
291-470K-RC 1
291-3.3K-RC 1
291-1K-RC 1
291-1.0-RC 3
553-WDU12-100 1
502-RAPC722X 1
512-LM7805ACT 1
625-1N4007-E3 1
512-MPSA92D27Z 6
291-10K-RC 24
291-1M-RC 6
610-MPSA42 7
36NE007 1
299-33K-RC 1
291-330K-RC 1
556-ATTINY2313-20PU 1
112-R13-24A-W 3
539-PT2745W 1
291-47K-RC 1
140-50N5-150J-TB-RC 2
815-AB-12-B2 1
649-DILB16P-223TLF 1
649-DILB20P-223TLF 1
649-67997-410HLF 1
594-K104M15X7RF53H5 3
78-1N4148 3
526-NTE74141 1