DRO-350 Bill of Materials
The following table lists the bill of materical needed to complete the DRO-350. It is divided into two sections, one for the PCB assembly and one for the enclosure. Note that vendors constantly update their prices so the costs listed below may vary.
Download Excel spreadsheet of BOM (CSV)
PCB Assembly |
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| Part | Description | Vendor | Vendor Part# | Quantity | ||
| 1N4148 | Diode | Mouser | 78-1N4148 | 4 | ||
| 1N5231 | Zener Diode, 5.1V | Mouser | 78-1N5231B | 1 | ||
| 1N5234 | Zener Diode, 6.2V | Mouser | 78-1N5234B | 1 | ||
| 1N5819 | Schottky Diode | Mouser | 625-1N5819 | 1 | ||
| 2N3904 | NPN General Purpose Amplifier | Mouser | 625-2N3904 | 1 | ||
| MAN6940 | Seven Segment LED Display, CC | Mouser | 512-MAN6940 | 9 | ||
| Capacitor | Ceramic Capacitor, 0.1uF 50V | Mouser | 21RZ310 | 12 | ||
| Capacitor | Electrolytic Capacitor, 100uF 16V | Mouser | 140-XRL16V100 | 1 | ||
| Capacitor | Tantalum Capacitor, 10uF 16V | Mouser | 80-T350E106K016 | 4 | ||
| ECS-ZTT | 20MHz Ceramic Resonator, with Caps | Mouser | 520-ZTT2000MX | 1 | ||
| L78M05CP | Positive 5.0V Voltage Regulator | Mouser | 512-LM78M05CT | 1 | ||
| LED | Red LED, 3mm (T1) | Mouser | 606-4303F1 | 6 | ||
| LM317T | 1.2V to 37V Voltage Regulator | Mouser | 512-LM317T | 1 | ||
| LM393AN | Low-Power Dual Voltage Comparator | Mouser | 512-LM393AN | 3 | ||
| M74HC238B1R | 3-to-8 Line Decoder | Mouser | 511-M74HC238 | 1 | ||
| M74HC4316B1R | Quad Bilateral Switch | Mouser | 512-MM74HC4316N | 2 | ||
| M74HC573B1R | Octal Latch w/ 3-State Non-Inverting | Mouser | 512-MM74HC573N | 3 | ||
| PIC16F876A | Flash 8-Bit CMOS Microcontroller | Mouser | 579-PIC16F876A-I/SP | 1 | ||
| Resistor | 1/4W 5% Resistor, 1K Ohm | Mouser | 660-CF1/4L102J | 6 | ||
| Resistor | 1/4W 5% Resistor, 10K Ohm | Mouser | 660-CF1/4L103J | 24 | ||
| Resistor | 1/4W 5% Resistor, 100K Ohm | Mouser | 660-CF1/4L104J | 2 | ||
| Resistor | 1/4W 5% Resistor, 1.5K Ohm | Mouser | 660-CF1/4L152J | 1 | ||
| Resistor | 1/4W 5% Resistor, 220 Ohm | Mouser | 660-CF1/4L221J | 1 | ||
| Resistor | 1/4W 5% Resistor, 56 Ohm | Mouser | 660-CF1/4L560J | 1 | ||
| Res Iso DIP16 | Resistor Array, 150 Ohm | Mouser | 652-4116R-1-150 | 3 | ||
| Switch | Mountain Tact Switch | Mouser | 101-0621 | 23 | ||
| UDN2983A | 8 Channel Darlington Source Driver | Digikey | TD62783AP-ND | 3 | ||
| ULN2803A | 8 Channel Darlington Sink Driver | Mouser | 511-ULN2803A | 3 | ||
| PCB | DRO-350 Bare PCB | ShumaTech | 99-0001 | 1 | ||
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Enclosure |
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| Part | Description | Vendor | Vendor Part# | Quantity | ||
| Switch Cap | Black Round Switch Cap, 12mm | Mouser | 101-0210 | 23 | ||
| Enclosure | Black Enclosure 1599HBK | Mouser | 546-1599H-BK | 1 | ||
| DIN4 Connector | Panel Mount 4 pin Mini-DIN Connector | Mouser | 161-2104 | 3 | ||
| DC Power Jack | Snap-in DC Power Jack, 2.1mm | Mouser | 163-1060 | 1 | ||
| Stereo Jack | Stereo 3.5mm Jack | Mouser | 161-7300 | 1 | ||
| Standoffs | 0.875" 6-32 M/F Alum Hex Standoff | Mouser | 534-8417 | 6 | ||
| D-Sub | 9 pin D-Sub Receptacle | Mouser | 156-1309 | 1 | ||
| Screws | 4-40 x 1/2" Black Machine Screws | 4-40-500 | 8 | |||
| Screws | 6-32 x 3/8" Machine Screw | 6-32-375 | 6 | |||
| Nuts | 4-40 Zinc Nuts | 4-40-N | 2 | |||
| Wall Wart | 9V 1A DC Wall Transformer 2.1mm | Mouser | 412-109124 | 1 | ||
| Overlay | Silk-Screened Lexan Overlay | ShumaTech | 99-0002/99-0003 | 1 | ||
The following list of components are optional:
Download Excel spreadsheet of optional parts (CSV)
Optional |
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| Part | Description | Vendor | Vendor Part# | Quantity | ||
| MTA100-2-R | MTA-100 2 pin receptacle | Mouser | 571-6404422 | 1 | ||
| MTA100-3-R | MTA-100 3 pin receptacle | Mouser | 571-6404423 | 1 | ||
| MTA100-4-R | MTA-100 4 pin receptacle | Mouser | 571-6404424 | 3 | ||
| MTA100-5-R | MTA-100 5 pin receptacle | Mouser | 571-6404425 | 1 | ||
| MTA100-2-H | MTA-100 2 pin header | Mouser | 571-6404562 | 1 | ||
| MTA100-3-H | MTA-100 3 pin header | Mouser | 571-6404563 | 1 | ||
| MTA100-4-H | MTA-100 4 pin header | Mouser | 571-6404564 | 3 | ||
| MTA100-5-H | MTA-100 5 pin header | Mouser | 571-6404565 | 1 | ||
| LENS-T1 | Low Profile T1 Lens - Clear | Mouser | 593-2000C | 1 | ||
| PIPE-T1 | T1 Light Pipe - Clear, 0.80" | Mouser | 593-LSV080C | 1 | ||
Parts List
The following parts lists shows each part listed by its designator on the PCB. This list is useful when constructing the DRO-350 so that parts can be easily looked up. Again, the list is correct to the best of my knowledge but it may contain errors or omissions.
Download Excel spreadsheet of parts list (CSV)
| Designator | Value | Description |
| C1 | 10uF | Tantalum Capacitor 16V |
| C2 | 0.1uF | Ceramic Capacitor, 50V |
| C3 | 10uF | Tantalum Capacitor 16V |
| C4 | 0.1uF | Ceramic Capacitor, 50V |
| C5 | 10uF | Tantalum Capacitor 16V |
| C6 | 0.1uF | Ceramic Capacitor, 50V |
| C7 | 100uF | Electrolytic Capacitor, 16V |
| C8 | 0.1uF | Ceramic Capacitor, 50V |
| C9 | 0.1uF | Ceramic Capacitor, 50V |
| C10 | 0.1uF | Ceramic Capacitor, 50V |
| C11 | 0.1uF | Ceramic Capacitor, 50V |
| C12 | 0.1uF | Ceramic Capacitor, 50V |
| C13 | 0.1uF | Ceramic Capacitor, 50V |
| C14 | 0.1uF | Ceramic Capacitor, 50V |
| C15 | 10uF | Tantalum Capacitor 16V |
| C16 | 0.1uF | Ceramic Capacitor, 50V |
| C17 | 0.1uF | Ceramic Capacitor, 50V |
| D1 | 1N5819 | Schottky Diode |
| D2 | 1N5231 | Zener Diode, 5.1V |
| D3 | 1N5234 | Zener Diode, 6.2V |
| D4 | 1N4148 | Diode |
| D5 | 1N4148 | Diode |
| D6 | 1N4148 | Diode |
| D7 | 1N4148 | Diode |
| DS1 | MAN6940 | Seven Segment LED Display, CC |
| DS2 | MAN6940 | Seven Segment LED Display, CC |
| DS3 | MAN6940 | Seven Segment LED Display, CC |
| DS4 | MAN6940 | Seven Segment LED Display, CC |
| DS5 | MAN6940 | Seven Segment LED Display, CC |
| DS6 | MAN6940 | Seven Segment LED Display, CC |
| DS7 | MAN6940 | Seven Segment LED Display, CC |
| DS8 | MAN6940 | Seven Segment LED Display, CC |
| DS9 | MAN6940 | Seven Segment LED Display, CC |
| DS10 | Red LED, 3mm (T1) | |
| DS11 | Red LED, 3mm (T1) | |
| DS12 | Red LED, 3mm (T1) | |
| DS13 | Red LED, 3mm (T1) | |
| DS14 | Red LED, 3mm (T1) | |
| DS15 | Red LED, 3mm (T1) | |
| JP1 | Header, 5-Pin | |
| JP2 | Header, 3-Pin | |
| JP3 | Header, 4-Pin | |
| JP4 | Header, 4-Pin | |
| JP5 | Header, 4-Pin | |
| JP6 | Header, 2-Pin | |
| JP7 | Header, 10-Pin | |
| JP8 | Header, 2-Pin, Dual row | |
| Q1 | 2N3904 NPN General Purpose Amplifier | |
| R1 | 10K | 1/4W 5% Resistor |
| R2 | 10K | 1/4W 5% Resistor |
| R3 | 10K | 1/4W 5% Resistor |
| R4 | 10K | 1/4W 5% Resistor |
| R5 | 10K | 1/4W 5% Resistor |
| R6 | 1K | 1/4W 5% Resistor |
| R7 | 1K | 1/4W 5% Resistor |
| R8 | 1K | 1/4W 5% Resistor |
| R9 | 100K | 1/4W 5% Resistor |
| R10 | 100K | 1/4W 5% Resistor |
| R11 | 220 | 1/4W 5% Resistor |
| R12 | 150 | Resistor Array |
| R13 | 150 | Resistor Array |
| R14 | 150 | Resistor Array |
| R15 | 10K | 1/4W 5% Resistor |
| R16 | 10K | 1/4W 5% Resistor |
| R17 | 10K | 1/4W 5% Resistor |
| R18 | 10K | 1/4W 5% Resistor |
| R19 | 10K | 1/4W 5% Resistor |
| R20 | 10K | 1/4W 5% Resistor |
| R21 | 10K | 1/4W 5% Resistor |
| R22 | 10K | 1/4W 5% Resistor |
| R23 | 10K | 1/4W 5% Resistor |
| R24 | 10K | 1/4W 5% Resistor |
| R25 | 10K | 1/4W 5% Resistor |
| R26 | 10K | 1/4W 5% Resistor |
| R27 | 1.5K | 1/4W 5% Resistor |
| R28 | 10K | 1/4W 5% Resistor |
| R29 | 10K | 1/4W 5% Resistor |
| R30 | 10K | 1/4W 5% Resistor |
| R31 | 10K | 1/4W 5% Resistor |
| R32 | 10K | 1/4W 5% Resistor |
| R33 | 10K | 1/4W 5% Resistor |
| R34 | 10K | 1/4W 5% Resistor |
| R35 | 56 | 1/4W 5% Resistor |
| R36 | 1K | 1/4W 5% Resistor |
| R37 | 1K | 1/4W 5% Resistor |
| R38 | 1K | 1/4W 5% Resistor |
| S1 | Mountain Tact Switch | |
| S2 | Mountain Tact Switch | |
| S3 | Mountain Tact Switch | |
| S4 | Mountain Tact Switch | |
| S5 | Mountain Tact Switch | |
| S6 | Mountain Tact Switch | |
| S7 | Mountain Tact Switch | |
| S8 | Mountain Tact Switch | |
| S9 | Mountain Tact Switch | |
| S10 | Mountain Tact Switch | |
| S11 | Mountain Tact Switch | |
| S12 | Mountain Tact Switch | |
| S13 | Mountain Tact Switch | |
| S14 | Mountain Tact Switch | |
| S15 | Mountain Tact Switch | |
| S16 | Mountain Tact Switch | |
| S17 | Mountain Tact Switch | |
| S18 | Mountain Tact Switch | |
| S19 | Mountain Tact Switch | |
| S20 | Mountain Tact Switch | |
| S21 | Mountain Tact Switch | |
| S22 | Mountain Tact Switch | |
| S23 | Mountain Tact Switch | |
| U1 | 16F876A | Flash 8-Bit CMOS Microcontroller |
| U2 | 74HC238 | 3-to-8 Line Decoder |
| U3 | LM393 | Low-Power Dual Voltage Comparator |
| U4 | LM393 | Low-Power Dual Voltage Comparator |
| U5 | LM393 | Low-Power Dual Voltage Comparator |
| U6 | 74HC4316 | Quad Bilateral Switch |
| U7 | 74HC573 | Octal Latch w/ 3-State Non-Inverting |
| U8 | UDN2983A | 8 Channel Darlington Source Driver |
| U9 | ULN2803A | 8 Channel Darlington Sink Driver |
| U10 | 74HC573 | Octal Latch w/ 3-State Non-Inverting |
| U11 | UDN2983A | 8 Channel Darlington Source Driver |
| U12 | ULN2803A | 8 Channel Darlington Sink Driver |
| U13 | 74HC573 | Octal Latch w/ 3-State Non-Inverting |
| U14 | UDN2983A | 8 Channel Darlington Source Driver |
| U15 | ULN2803A | 8 Channel Darlington Sink Driver |
| U16 | 7805 | Positive 5.0V Voltage Regulator |
| U17 | LM317 | 1.2V to 37V Voltage Regulator |
| U18 | 74HC4316 | Quad Bilateral Switch |
| Y1 | 20.0MHz | Ceramic Resonator, with Caps |