Description
The MM5314N rather been withdrawn from the manufacture, likely it exist somewhere in small quantities. I don’t have nobody information round he.
Circuit diagram
Part list
The digital clock of circuit, has as base one IC, the MM5314N, in which
are contained all the circuits that need. The IC1 collaborates with six
Display of common anode, that are not critically as materials. You can
select what dimension, you want it is enough you adapt pins their in the
circuit. The display are drive by a system of polyplexis and are drive
by thirteen transistors. For timing the circuit, is used the frequency
of network (50HZ). This solution is the simplest, that it is not best.
For more constant frequency you can use a circuit that would be based on
crystal, (it will be given shortly). For the clue of hour are used six
display of 7 element common anode. The DS1-DS2, show the hours
(decades-unit respectively), the DS3-DS4, show the minutes and DS5-DS6,
the seconds. The common anode, for each display is drive by the
collector of transistors Q8 until Q13. Individual led (a, b, c, d, e, f,
g) the display, they are linked between them (parallel) and are drive
by the transistors Q1.. Q7, creating thus a system multiplexing, to
frequency 1KHZ, that is determined by the R3-C3. The power supply is a
classic circuit, from T1 and GR1, C1. The remainder capacitors as the
C2-C5 and the R5 make local unyoke of voltage and protect the IC1 from
peaks of voltage. The diode D1, limit the top, of rectified vibrations
in the pin 16. Resistances R18...24, limit the current that leak the
led. With switch S1 in place 2, the clock measures the time and the
display remains openly, with the S1 in place 1, the display they remain
closed, the clock however continues working. This operation us allows to
have the clock in spaces that we do not want exists the lighting of
display. With the S2 in place 1, we have measurement in 12-hours base
while in place 2, we have measurement in 24-hours base. With the S3 in
place 1, we see the measurement in seconds, while in place 2, we only
see the measurement in hours and minutes, while the seconds do not
function. With switches S4, S5, S6, we make the regulation of hour when
exists some interruption in the operation of clock, and becomes with the
classic way that usually becomes in this type the clocks. The pin 11 [
5060 of HZ Select ] is the input with which we select the operation of
MM5314 in main voltage frequency 60HZ or 50HZ. When we have main voltage
110Vac- 60HZ [USA system] then the pin 11 is connected in Vss @pin 2.
If the main voltage is 220Vac - 50HZ [Europe system] the pin 11 is not
connected nowhere, remain that is to say in air. Pin 16 [5060 input], is
the input, where is applied sample from the main voltage [50HZ or
60HZ]. With this sample function the counter circuits and become the
measurement of time. Thus if you have 220Vac/50HZ, then the pin 11
remains void. If you have 110V/60HZ, then the pin 11 it's connected in
Vss @ pin 2.
Notice: The MM5314N rather been withdrawn from the manufacture, likely it exist somewhere in small quantities. I don’t have nobody information round he.
Circuit diagram
- R1= 100Kohms
- R2= 47Kohms
- R3= 100Kohms
- R4.....10= 2.2Kohms
- R11.....17= 10Kohms
- R18.....24-25-26= 220 ohms 0W5
- R25-26=1.2Kohms 0W5
- C1= 2200uF 25V
- C2= 100uF 25V
- C3= 18nF 100V polyester
- C4-5= 10nF ceramic OR polyester
- Q1....7= BC550
- Q8....13= BC560
- IC1= MM5314N ***[See Notice]
- D1= 1N4148
- GR1= 4X1N4002
- S1...3= 1X2 mini switch
- S4...6= Push Button normal open
- T1= 220V AC/12V 1A
- DS1....DS7= Display 7 segmens Common Anode
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