A red indicator LED was specced from the distributor's site. An online calculator predicted an 830 Ohm resistor was necessary for the LED at 9V. The items in the shopping car were each used to create a list with link to each product. The list was made in a spreadsheet program and pasted to the blog. See below.
The schematics were updated to include the LED and resistor. These components do no draw from the adjustable current portion of the circuit.
To do:
| Digikey Part Number | Description | Quantity | Link |
| LM334ZNS/NOPB-ND | Current regulator | 1 | LM334ZNS/NOPB-ND |
| 026T419S101A1A1-ND | 100 Ohm potentiometer | 1 | 026T419S101A1A1-ND |
| 34.0XBK-ND | 34 Ohm current limiting resistor | 1 | 34.0XBK-ND |
| SR252B-ND | Enclosure with 9V compartment | 1 | SR252B-ND |
| BS12T-ND | 9V Battery clip | 1 | BS12T-ND |
| Q2F018B-ND | 1/8" Shrink tubing | 1 | Q2F018B-ND |
| SW647-ND | Rocker switch | 1 | SW647-ND |
| C2003W-5-ND | White wire | 1 | C2003W-5-ND |
| C2003L-5-ND | Blue wire | 1 | C2003L-5-ND |
| CP-3536-ND | Phone socket | 1 | CP-3536-ND |
| CP3-1005-ND | Phone jack | 1 | CP3-1005-ND |
| 290-1951-ND | Alligator clip | 2 | 290-1951-ND |
| 754-1264-ND | Red LED | 1 | 754-1264-ND |
| CF14JT820RCT-ND | 830 Ohm LED resistor | 1 | CF14JT820RCT-ND |
| Milliammeter | 1 | DC 3mA Analog Ammeter | |
| Electrode wires | 1 | eBay electrode wire search | |
| Electrode pads | 1 | eBay electrode search |
The schematics were updated to include the LED and resistor. These components do no draw from the adjustable current portion of the circuit.
Updated schematic
To do:
- Install current regulator
- Test + Verify safety
Journal Page
The rest of the posts for this project have been arranged by date.
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