EESchema Schematic File Version 4 EELAYER 30 0 EELAYER END $Descr A4 11693 8268 encoding utf-8 Sheet 3 3 Title "TashTwenty Tiny" Date "2022-03-20" Rev "1.0" Comp "Lostwave" Comment1 "https://68kmla.org" Comment2 "https://68kmla.org/bb/index.php?threads/tashtwenty-single-chip-dcd-hard-disk-20-interface.39357/" Comment3 "https://github.com/lampmerchant/tashtwenty" Comment4 "" $EndDescr $Comp L power:+12V #PWR0103 U 1 1 61A7DDE6 P 1500 1500 F 0 "#PWR0103" H 1500 1350 50 0001 C CNN F 1 "+12V" H 1515 1673 50 0000 C CNN F 2 "" H 1500 1500 50 0001 C CNN F 3 "" H 1500 1500 50 0001 C CNN 1 1500 1500 1 0 0 -1 $EndComp $Comp L Device:LED D1 U 1 1 61A7E10E P 1500 2250 F 0 "D1" V 1539 2132 50 0000 R CNN F 1 "LED" V 1448 2132 50 0000 R CNN F 2 "LED_THT:LED_D5.0mm_Horizontal_O3.81mm_Z3.0mm" H 1500 2250 50 0001 C CNN F 3 "~" H 1500 2250 50 0001 C CNN 1 1500 2250 0 -1 -1 0 $EndComp $Comp L power:GND #PWR0119 U 1 1 61A7EA4F P 1500 2500 F 0 "#PWR0119" H 1500 2250 50 0001 C CNN F 1 "GND" H 1505 2327 50 0000 C CNN F 2 "" H 1500 2500 50 0001 C CNN F 3 "" H 1500 2500 50 0001 C CNN 1 1500 2500 1 0 0 -1 $EndComp $Comp L Device:R R8 U 1 1 61A7F7FD P 1500 1800 F 0 "R8" H 1570 1846 50 0000 L CNN F 1 "1200" H 1570 1755 50 0000 L CNN F 2 "Resistor_THT:R_Axial_DIN0207_L6.3mm_D2.5mm_P7.62mm_Horizontal" V 1430 1800 50 0001 C CNN F 3 "~" H 1500 1800 50 0001 C CNN 1 1500 1800 1 0 0 -1 $EndComp Wire Wire Line 1500 2100 1500 1950 Wire Wire Line 1500 1650 1500 1500 Wire Wire Line 1500 2500 1500 2400 $Comp L 74xx:74LS08 U2 U 2 1 61A7FDAB P 6400 1500 F 0 "U2" H 6400 1825 50 0000 C CNN F 1 "74ACT08" H 6400 1734 50 0000 C CNN F 2 "Package_DIP:DIP-14_W7.62mm" H 6400 1500 50 0001 C CNN F 3 "http://www.ti.com/lit/gpn/sn74LS08" H 6400 1500 50 0001 C CNN 2 6400 1500 1 0 0 -1 $EndComp $Comp L 74xx:74LS08 U2 U 3 1 61A839C6 P 6400 2500 F 0 "U2" H 6400 2825 50 0000 C CNN F 1 "74ACT08" H 6400 2734 50 0000 C CNN F 2 "Package_DIP:DIP-14_W7.62mm" H 6400 2500 50 0001 C CNN F 3 "http://www.ti.com/lit/gpn/sn74LS08" H 6400 2500 50 0001 C CNN 3 6400 2500 1 0 0 -1 $EndComp $Comp L Device:LED_Dual_ACA D2 U 1 1 61A8E744 P 7650 2000 F 0 "D2" H 7650 1653 50 0000 C CNN F 1 "LED_Dual_ACA" H 7650 1744 50 0000 C CNN F 2 "LED_THT:LED_D5.0mm-3_Horizontal_O3.81mm_Z3.0mm" H 7650 2000 50 0001 C CNN F 3 "~" H 7650 2000 50 0001 C CNN 1 7650 2000 -1 0 0 1 $EndComp $Comp L Device:R R11 U 1 1 61A90834 P 7000 2500 F 0 "R11" V 6793 2500 50 0000 C CNN F 1 "330" V 6884 2500 50 0000 C CNN F 2 "Resistor_THT:R_Axial_DIN0207_L6.3mm_D2.5mm_P7.62mm_Horizontal" V 6930 2500 50 0001 C CNN F 3 "~" H 7000 2500 50 0001 C CNN 1 7000 2500 0 1 1 0 $EndComp $Comp L Device:R R10 U 1 1 61A90C1F P 7000 1500 F 0 "R10" V 6793 1500 50 0000 C CNN F 1 "330" V 6884 1500 50 0000 C CNN F 2 "Resistor_THT:R_Axial_DIN0207_L6.3mm_D2.5mm_P7.62mm_Horizontal" V 6930 1500 50 0001 C CNN F 3 "~" H 7000 1500 50 0001 C CNN 1 7000 1500 0 1 1 0 $EndComp Wire Wire Line 6700 1500 6850 1500 Wire Wire Line 6700 2500 6850 2500 Wire Wire Line 7350 1900 7250 1900 Wire Wire Line 7250 1900 7250 1500 Wire Wire Line 7250 1500 7150 1500 Wire Wire Line 7150 2500 7250 2500 Wire Wire Line 7250 2500 7250 2100 Wire Wire Line 7250 2100 7350 2100 Wire Wire Line 8100 2000 7950 2000 Text GLabel 4300 1800 0 50 Input ~ 0 RD Text GLabel 6000 2600 0 50 Input ~ 0 WR Wire Wire Line 6000 2600 6100 2600 $Comp L 74xx:74LS08 U2 U 1 1 61A935ED P 6400 3500 F 0 "U2" H 6400 3825 50 0000 C CNN F 1 "74ACT08" H 6400 3734 50 0000 C CNN F 2 "Package_DIP:DIP-14_W7.62mm" H 6400 3500 50 0001 C CNN F 3 "http://www.ti.com/lit/gpn/sn74LS08" H 6400 3500 50 0001 C CNN 1 6400 3500 1 0 0 -1 $EndComp Text GLabel 6000 3600 0 50 Input ~ 0 ~ENABLE Wire Wire Line 6000 3600 6100 3600 Wire Wire Line 4300 1800 4450 1800 Wire Wire Line 5750 2300 5750 2400 Wire Wire Line 5750 1900 5750 2000 $Comp L power:+5V #PWR0121 U 1 1 61A97370 P 5750 1900 F 0 "#PWR0121" H 5750 1750 50 0001 C CNN F 1 "+5V" H 5765 2073 50 0000 C CNN F 2 "" H 5750 1900 50 0001 C CNN F 3 "" H 5750 1900 50 0001 C CNN 1 5750 1900 1 0 0 -1 $EndComp $Comp L Device:R R9 U 1 1 61A96CB0 P 5750 2150 F 0 "R9" H 5820 2196 50 0000 L CNN F 1 "10k" H 5820 2105 50 0000 L CNN F 2 "Resistor_THT:R_Axial_DIN0207_L6.3mm_D2.5mm_P7.62mm_Horizontal" V 5680 2150 50 0001 C CNN F 3 "~" H 5750 2150 50 0001 C CNN 1 5750 2150 1 0 0 -1 $EndComp $Comp L power:+5V #PWR0124 U 1 1 61AB25B5 P 5250 900 F 0 "#PWR0124" H 5250 750 50 0001 C CNN F 1 "+5V" H 5265 1073 50 0000 C CNN F 2 "" H 5250 900 50 0001 C CNN F 3 "" H 5250 900 50 0001 C CNN 1 5250 900 1 0 0 -1 $EndComp $Comp L Device:R R13 U 1 1 61AB25BF P 5250 1250 F 0 "R13" H 5320 1296 50 0000 L CNN F 1 "10k" H 5320 1205 50 0000 L CNN F 2 "Resistor_THT:R_Axial_DIN0207_L6.3mm_D2.5mm_P7.62mm_Horizontal" V 5180 1250 50 0001 C CNN F 3 "~" H 5250 1250 50 0001 C CNN 1 5250 1250 1 0 0 -1 $EndComp $Comp L Transistor_BJT:BC337 Q1 U 1 1 61AB9694 P 5150 1800 F 0 "Q1" H 5341 1846 50 0000 L CNN F 1 "BC337" H 5341 1755 50 0000 L CNN F 2 "Package_TO_SOT_THT:TO-92_Inline" H 5350 1725 50 0001 L CIN F 3 "https://diotec.com/tl_files/diotec/files/pdf/datasheets/bc337.pdf" H 5150 1800 50 0001 L CNN 1 5150 1800 1 0 0 -1 $EndComp $Comp L Device:R R12 U 1 1 61ABBEBE P 4600 1800 F 0 "R12" V 4393 1800 50 0000 C CNN F 1 "10k" V 4484 1800 50 0000 C CNN F 2 "Resistor_THT:R_Axial_DIN0207_L6.3mm_D2.5mm_P7.62mm_Horizontal" V 4530 1800 50 0001 C CNN F 3 "~" H 4600 1800 50 0001 C CNN 1 4600 1800 0 1 1 0 $EndComp Wire Wire Line 4750 1800 4950 1800 $Comp L power:GND #PWR0125 U 1 1 61ABD1D4 P 5250 2100 F 0 "#PWR0125" H 5250 1850 50 0001 C CNN F 1 "GND" H 5255 1927 50 0000 C CNN F 2 "" H 5250 2100 50 0001 C CNN F 3 "" H 5250 2100 50 0001 C CNN 1 5250 2100 1 0 0 -1 $EndComp Wire Wire Line 5250 2100 5250 2000 Wire Wire Line 5250 1600 5250 1500 Connection ~ 5250 1500 Wire Wire Line 5250 900 5250 1100 Wire Wire Line 5250 1500 5750 1500 Wire Wire Line 5250 1500 5250 1400 Wire Wire Line 8100 2000 8100 3500 Wire Wire Line 5750 1600 5750 1500 Wire Wire Line 5750 1600 6100 1600 Wire Wire Line 5750 1500 5750 1400 Wire Wire Line 5750 1400 6100 1400 Connection ~ 5750 1500 Wire Wire Line 5750 3400 5750 2400 Wire Wire Line 5750 2400 6100 2400 Connection ~ 5750 2400 Wire Wire Line 5750 3400 6100 3400 Wire Wire Line 6700 3500 8100 3500 Text Notes 6600 3950 0 50 Italic 0 This gate will sink the led when /ENABLE is low.\n\nRead is /ENABLE low AND RD low\nWrite is /ENABLE low and WR high $EndSCHEMATC