Resistors are the least glamorous component on a PCB. They are also the most used. A well‑stocked resistor kit means the difference between finishing a prototype tonight and waiting for a DigiKey order to arrive tomorrow. The QUADRIOS 23P130 gives you 2,000 metal film resistors in one box — 20 values, 100 pieces each — enough for most general‑purpose analog and digital circuits.

What Is Actually in the Box

The kit covers the E‑series range from 1Ω to 1MΩ. The exact values in the 23P130 assortment are the standard E24 series spread across this range, selected for maximum utility. Common values like 10Ω, 100Ω, 220Ω, 1kΩ, 10kΩ, 100kΩ, and 1MΩ are all included. With 100 pieces of each value, you can build multiple designs without rationing.

Why Metal Film, Not Carbon

Metal film resistors have several advantages over carbon film types. The 1% tolerance is much tighter than carbon film (typically 5–10%), which matters for voltage dividers, op‑amp gain networks, and current sensing. The ±100 ppm/°C temperature coefficient means the resistance does not drift significantly with temperature — essential for precision analog circuits. And metal film resistors generate less thermal noise (Johnson noise) than carbon composition types.

The 0.5W rated power is sufficient for most signal‑level circuits. For a typical 5V circuit, 0.5W allows up to 100 mA through a 50Ω resistor, which covers LED current limiting, pull‑up resistors, series termination, and most op‑amp feedback networks. For power‑handling applications like high‑current shunt sensing, you would need a larger resistor.

Axial Leaded vs. SMD

Axial leaded resistors (the ones with wire leads sticking out both ends) are increasingly rare as the industry moves to surface‑mount. But they still have advantages. You can solder them into perfboard or breadboard without a PCB. You can bend the leads to fit unusual spacing. You can reuse them after desoldering — unlike SMD parts, which often get damaged during removal. For prototyping, education, and low‑volume production, axial leaded resistors are simply more convenient.

The leads are tinned and solderable, compatible with standard 0.1-inch perfboard and breadboard spacing. The body size is the standard 3.5mm diameter, fitting most resistor lead forming tools and storage bins.

Who This Kit Is For

This 2,000‑piece kit (23P130) is for people who build regularly — hobbyists with a decent sized workbench, small electronics labs, educational institutions, and low‑volume production lines. The 100 pieces per value mean you can design a small run of boards (say, 25 units) without running out of any single value halfway through.

If you build only occasionally, the 200‑piece kit (22P081) with 10 pieces per value is more appropriate. If you are a professional doing medium‑volume production, the 1,000‑piece kit (22P083) with 50 pieces per value might be the right balance. The 23P130 is for when you want to be well‑stocked without excess.