ET-P23
LM317 Adjustable Regulator
Clean adjustable 1.25–28 V linear supply, 1.5 A
AED 15.00
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Overview
Clean adjustable 1.25–28 V linear supply, 1.5 A
The ET-P23 is built around the LM317 adjustable linear — Vout = 1.25V × (1 + VR1/240Ω), 1.5A max (heat-limited).
Designed in Dubai by ElectroTrical — the full schematic, BOM and design notes are published below.
Good for
- Bench reference voltages
- Noise-sensitive analog circuits
- Odd-voltage parts
Key features
What makes it different
Regulator
LM317 adjustable linear: Vout = 1.25V × (1 + VR1/240Ω), 1.5A max (heat-limited)
Input
Vout + 3V … 35V
Output
1.25V to ~28V (VIN-limited); 25-turn trimmer
Noise
Linear — no switching noise; ADJ bypass for low ripple
Open documentation
Schematic, BOM and layout notes published for every board.
Breadboard friendly
Standard 2.54 mm pitch and M2.5 mounting holes.
Specifications
Technical specifications
| Regulator | LM317 adjustable linear: Vout = 1.25V × (1 + VR1/240Ω), 1.5A max (heat-limited) |
|---|---|
| Input | Vout + 3V … 35V |
| Output | 1.25V to ~28V (VIN-limited); 25-turn trimmer |
| Noise | Linear — no switching noise; ADJ bypass for low ripple |
| Size | 35.0 × 25.0 mm |
|---|---|
| Mounting | 4 × M2.5 holes, 2.54 mm from each corner |
| Connectors | 2-pin 2.54 mm header · Screw terminal 2P 5.0mm 17A (THT) — VIN · Screw terminal 2P 5.0mm 17A (THT) — VOUT |
| Main IC | LM317AG-AA3-R (LCSC C97333) |
| Revision | Rev A |
| Libraries | No software needed |
|---|
Performance
Output
Pinout
Pin map and connections
| Pin | Name | Type | Function |
|---|---|---|---|
| 1 | VOUT | Power | Regulated output |
| 2 | GND | Ground | Ground |
Mechanical
Dimensions and what's in the box
In the box
- 1 × ET-P23 LM317 Adjustable Regulator (assembled)
- 1 × 2-pin 2.54 mm male header, unsoldered
Getting started
- Wire the header: VOUT, GND
- Libraries: No software needed
Compare
Which power board?
| LM317 Adjustable Regulator (this board)This board | ET-P21 PT4115 LED Driver 670 mA | ET-P22 USB-C 2S Li-ion Charger | ET-P24 TPS25947 eFuse Protector | |
|---|---|---|---|---|
| What it does | Clean adjustable 1.25–28 V linear supply, 1.5 A | Constant-current driver for 1–8 power LEDs, PWM dimming | Charge a 2S (7.4 V) pack from any 5 V USB-C charger | Resettable electronic fuse with adjustable current limit |
| Interface | Vout + 3V … 35V | PWM or analog dimming on DIM, 3.3/5V logic | USB-C 5V (any USB-C charger; 5V/2A or more for… | EN input, PG output |
| Best for | Bench reference voltages | 3 W power LED lamps | 7.4 V robot packs | Protecting 12 V projects from shorts |
| Price | 15 AED | 49 AED | 19 AED | 49 AED |
Downloads
Documents and design files
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