4-Bit-Discrete-Transistor-Adder

PhdWizards·4-Bit-Discrete-Transistor-Adder·pcb/Calculator_ver1.kicad_pcb

4-Bit-Discrete-Transistor-Adder PCB layout, top view — open source board by PhdWizards

About the 4-Bit-Discrete-Transistor-Adder PCB

4-Bit-Discrete-Transistor-Adder is an open source PCB design by PhdWizards, published on GitHub. It is a 2-layer board measuring 166.4 × 181.6 mm, with 307 components from 17 distinct parts.

Other key parts include the 74HC04N, SN74HC08N, SN74HC32N, CD74HC283E and CD4511BE. By type, the board carries 178 resistors, 100 transistors, 10 ICs, 9 switches, 6 diodes and 2 capacitors.

It belongs with the displays & leds designs in this gallery.

From the project

The core 4-bit binary adder is implemented entirely using discrete transistor-resistor logic. The resulting 5-bit binary value is converted to BCD using 74HC-series logic and displayed on two 7-segment displays.

Two 4-bit binary values are entered using eight switches:

The values are added together by the transistor-based logic, producing a 5-bit result:

The 5-bit result is then converted into BCD:

The PCB was designed in KiCad as a two-layer board.

An Interactive BOM generated from KiCad is included in the repository. It provides: - Component references - Component values - Footprints - Quantities - Front and back PCB views - Component locations Open Interactive BOM

4-Bit-Discrete-Transistor-Adder, from the project README — From the project README

Main components on the 4-Bit-Discrete-Transistor-Adder

74HC04NSN74HC08N SN74HC32NCD74HC283ECD4511BE D148K

4-Bit-Discrete-Transistor-Adder bill of materials (BOM)

307 components, 17 distinct parts.

Qty	Part	Footprint	Refs
1	74HC04N	DIP764W47P254L1920H431Q14	U1
3	SN74HC08N	DIP794W45P254L1969H508Q14	U2, U3, U4
1	SN74HC32N	DIP794W45P254L1969H508Q14	U5
1	CD74HC283E	DIP794W45P254L1969H508Q16	U6
2	CD4511BE Texas Instruments	DIP794W45P254L1969H508Q16	U7, U8
2	D148K	D1X8K	U9, U10
100	NPN	TO-92	Q1, Q2, Q3, Q4, Q5, Q6, Q7, Q8 +92
1	USB_C_Receptacle_PowerOnly_24P	USB_C_Receptacle_HRO_TYPE-C-31-M-12	J1
1	MF-R075	Fuse_Bourns_MF-RHT070	F1
9	MTS-102	MTS-102	SW1, SW2, SW3, SW4, SW5, SW6, SW7, SW8 +1
6	LED	LED_D5.0mm	D1, D2, D3, D4, D5, D6
1	100nF	C_Radial_D5.0mm_H5.0mm_P2.00mm	C1
1	100uF	CP_Radial_D12.5mm_P7.50mm	C2
156	1k	R_Axial_DIN0207_L6.3mm_D2.5mm_P7.62mm_Horizontal	R1, R5, R6, R7, R8, R9, R10, R11 +148
2	5.1k	R_Axial_DIN0207_L6.3mm_D2.5mm_P7.62mm_Horizontal	R2, R3
6	330R	R_Axial_DIN0207_L6.3mm_D2.5mm_P7.62mm_Horizontal	R4, R160, R161, R162, R163, R164
14	330	R_Axial_DIN0207_L6.3mm_D2.5mm_P7.62mm_Horizontal	R165, R166, R167, R168, R169, R170, R171, R172 +6

4-Bit-Discrete-Transistor-Adder design files

The KiCad project lives in the PhdWizards/4-Bit-Discrete-Transistor-Adder repository on GitHub; these links point at the commit this page was built from.

Layoutpcb/Calculator_ver1.kicad_pcb

4-Bit-Discrete-Transistor-Adder: common questions

How big is the 4-Bit-Discrete-Transistor-Adder PCB?

The 4-Bit-Discrete-Transistor-Adder measures 166.4 × 181.6 mm, has 2 copper layers and is 1.6 mm thick.

How many components are on the 4-Bit-Discrete-Transistor-Adder?

307 components, from 17 distinct parts. The full bill of materials is listed on this page.

Where can I download the 4-Bit-Discrete-Transistor-Adder design files?

From the PhdWizards/4-Bit-Discrete-Transistor-Adder repository on GitHub, which has the KiCad layout; the links under Design files point to each one.

Can I use the 4-Bit-Discrete-Transistor-Adder design in my own project?

The repository has no license, so all rights stay with PhdWizards. Use it as a reference, and ask the author before reusing the design.

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