SamGordon clock

SamGordon Digital Clock

1. Main Clock

SG_clock_main.gif (25734 bytes)

�� , �� . �� , �� SamClock. �� 1990, � �� , �� . �� TTL, �� IC9 �� IC13, �� CMOS, �� display �� . �� 4511 [6], �� 74LS47 [7], �� display �� . �� display �� Fig.2, �� , �� display. �� SL10 �� 1�� [Fig.3-4], �� IC2 �� IC4 �� , �� , �� . �� Q1 �� display �� [Fig.2], �� B �� C Led �� Display DIS6 [Fig.2], �� 1, �� 10, 11, 12. �� . � �� +5VA �� IC9 �� IC13 �� , �� +5VB, �� IC9 �� IC13 �� display �� [Fig.5]. �� Q1 ��, �� .

	Main Clock Part List

R1=2.2Kohm 1/4W 5%	IC5-7=74HC32 [3]	Q1=BD139 on Heatsink
R2......R38=470ohm 1/4W 5%	IC6=74HC08 [4]	SL1....SL5=7 pin connector
IC1-4=74HC390 [1]	IC8=74HC04 [5]	SL6-7=2 pin connector
IC2-3=74HC92 [2]	IC9....IC13=4511 [6] or [74LS47] [7]	SL8=3 pin connector

[1] 74HC390 or 74LS390= Dual 4bit Decade and Binary COUNTER	[5] 74HC04 or 74LS04= Hex inverter
[2] 74HC92 or 74LS92= Decade, divide by 12 and Binary COUNTER	[6] 4511= BCD to 7-segment Latch/Decoder/Driver for CC Display*
[3] 74HC32 or 74LS32= Quad 2-input OR gate	[7] 74LS47= BCD to 7-segment Decoder/Driver for CA Display*
[4] 74HC08 or 74LS08= Quad 2-input AND gate	CC=Common Cathode	CA=Common Anode

2. Display

SG_clock_display.gif (13544 bytes)

�� Fig.2, �� display ��. �� display �� IC9�IC13, �� 4511 [6]. �� DIS1 �� DIS5, �� DIS6 �� . �� 74LS47 [7], �� DIS1�DIS5* �� , �� 1 �� 6 �� +5VB �� R39-40,�� 0V. �� R39-40, �� DIS3 �� DIS5, �� display �� , �� .

	Display Part List

R39-40=220ohm 1/2W 5%	DIS6=20 mm Led Display Common Anode	SL10.....SL4=7 pin connector
DIS1-5=20 mm Led Display Common Cathode*	SL9-15=2 pin connector	*See Text

*DIS1-5=20 mm Led Display Common Cathode with driver 4511 [6]

*DIS1-5=20 mm Led Display Common Cathode with driver 74LS47 [7]

3. Time Base [A Choise]

SG_clock_time_A.gif (14243 bytes)

�� 1�� . �� . �� 1��. �� . � �� Fig.3, �� 1�� 1�� 10, �� IC15 �� IC17. �� IC18A-B �� IC19A-B �� , �� S1�� S2 �� . �� S1 [Super Fast] �� S2 [Fast], �� 10�� 100�� , �� display �� . � �� +5VA, �� , �� .

	Time Base [A] Part List

R41-42=470ohm	IC14=74HC04*	IC19=74HC08*
R43-44=10Kohm	IC15-16-17=74HC390*	S1-2=Push Button normal open
CSL1=1MHZ Crystal	IC18=74HC32*	*See component list in Main Clock

4. Time Base [B Choise]

SG_clock_time_B.gif (12199 bytes)

�� Fig.4, �� Fig.3, �� 3.2768 ��, �� , �� 1��, �� SL19. �� C3 �� TEST �� 204800 ��. �� S1 [Fast] �� S2 [Super Fast] �� display �� , �� 10�� 100��, �� display �� . � �� +5VA, �� , �� . � �� .

	Time Base [B] Part List

R45=10Mohm	IC20=4060 [8]	CSL2=3.2768 MHZ crystal
C1-2=22pF ceramic	IC21-22=4017 [9]	S3-4=Push switch recrudescent
C3=22pF trimmed capacitor	IC23=4013 [10]

[8] 4060=14-stage Ripple Carry Binary Counter/Divider and Oscillator	[10] 4013=dual D Flip-Flop
[9] 4017=Hex "D"-type Flip-Flop

5. Power Supply for SamGordon Clock

SG_clock_supply.gif (15085 bytes)

�� Fig.5, �� , �� . � �� TR1, �� IC24 �� +5V [P1]. �� . � �� IC25 �� TR2, �� [P2] �� +6.9V, �� 6V/1.2Ah, � �� SL17. �� RL1�� Fig.5. � �� +5VA �� D5-6 �� 6V, �� +5VB �� 0V �� Display �� . �� , �� display �� . �� C17. �� IC24-25 �� TR1-2 �� .

	Power Supply Part List

R46=1.2Kohm 2W	C16=1uF 25V	B2=4 X 1N4001
R47-49=270ohm	C17=1000uF 16V	RL1=12VDC 2X2 [10A]
R48=	D1=12V 1W zener	TR1-2=4.7Kohm trimmer
C6=2200uF 25V	D2-3=1N4002	SL17-18=2 pin connector
C7-9-10-13-15=100nF 100V MKT	D4-5-6=1N5408	SL16=3 pin connector
C8-12-14=10uF 25V	IC24-25=LM317 on Heatsink	BATT=AKKU battery 6V/1.2Ah
C11=47uF 25V	B1=100V 3A Bridge Rectifier

6. Block Diagram

SG_clock_block.gif (11622 bytes)

7. Connection for Display common Anode or Cathode

SG_clock_display_conn.gif (10601 bytes)

�� Fig.6, �� Block �� . �� Fig.7, �� Display �� . �� , �� . �� , �� �� .

Sam Electronic Circuits 6/02

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