Plusivo 600 Pcs Resistor Assortment Kit

Plusivo 600 Resistor Kit: Color Code Reference

Plusivo's 600-piece kit fits 30 standard E-series values¹.

Covering values from 10Ω to 1MΩ with ±1% metal film tolerance², this compact assortment provides every resistor you need for LED current limiting, pull-up networks, voltage dividers, and RC filter stages in a single organized package. At 20 pieces per value, the 600-piece count supports extended prototyping sessions for most breadboard and PCB builds. Because all 30 values follow E12 and E24 preferred value spacing¹, the color code calculator above identifies each resistor accurately by selecting its five bands in order³.

Specifications²

Building LED, pull-up, and voltage divider circuits from the Plusivo 30-value set

The Plusivo kit's 30 values span 10Ω to 1MΩ, covering every resistor used in typical microcontroller prototyping. For an LED circuit at 5V with a red LED (Vf ≈ 1.8V) and a target current of 15 mA, calculate R = (5 − 1.8) / 0.015 = 213Ω and select 220Ω from the kit. At 3.3V with the same LED, R = (3.3 − 1.8) / 0.015 = 100Ω; the Plusivo kit includes 100Ω. For blue or white LEDs (Vf ≈ 3.2V) at 5V targeting 10 mA: R = (5 − 3.2) / 0.010 = 180Ω. The closest E-series value in the kit is 180Ω if included, or 220Ω for a conservative 8.2 mA.

Working through these calculations by hand for every LED color and supply voltage combination takes several minutes per build, which is why having the color code calculator above to verify each band selection before you solder saves both time and components. The tool also flags when your chosen resistor would push the LED past its maximum rated current, protecting the part before you power up.

Choosing the nearest E-series value from the Plusivo kit

Start with the calculated ideal value, then choose the nearest E12 or E24 value that keeps current within your target range. For LEDs, round up when in doubt; for pull-ups, choose based on speed and current budget. When the calculated ideal resistor value falls between two standard E24 values, rounding up is the conservative choice for LED circuits because it guarantees the current stays at or below the target, protecting the LED from overcurrent even when the resistor measures at the low end of its tolerance band.

For I²C pull-ups on a 3.3V microcontroller bus with 100 pF of total capacitance, 4.7kΩ gives a rise time of 4.7kΩ × 100 pF × 2.2 = 1.03 µs, within the 1 µs limit for standard mode I²C⁴. The Plusivo kit includes 4.7kΩ. For fast mode at 400 kHz, where the rise time limit is 300 ns⁴, use 1kΩ: 1kΩ × 100 pF × 2.2 = 220 ns, safely within spec.

Voltage divider design using Plusivo kit values

For an ADC battery monitor reading a 4.2V LiPo on a 3.3V ADC reference, you need a divider ratio of 3.3 / 4.2 = 0.786. Setting R2 = 100kΩ and solving for R1: R1 = R2 × (1 − 0.786) / 0.786 = 100kΩ × 0.272 = 27.2kΩ. Select 27kΩ from the Plusivo kit (E24 value). Confirm the calculator above reads the selected resistors before soldering: set both bands in turn and verify the displayed values match 27kΩ and 100kΩ. When the divider resistors are both ±1%, the worst-case ratio error is 2%, keeping the ADC reading within 82 counts of the true value across the full battery discharge curve, which is sufficient for accurate state-of-charge estimation in battery-powered devices.

Why ±1% metal film tolerance matters and when ±5% carbon film is sufficient

Metal film resistors achieve their ±1% tolerance through a thin metal alloy film deposited on a ceramic substrate and laser-trimmed to the final value, and you can decode any resistor color band in the calculator above to confirm that tolerance before you build⁵. Carbon film resistors use a carbon layer that is less stable with temperature and can only be laser-trimmed to approximately ±5%, which is why they cost less but suit only non-critical applications where the wider tolerance band does not affect circuit performance⁶. The Plusivo kit's ±1% metal film construction gives a tighter production spread and better temperature stability than the ±5% carbon film parts found in older and cheaper kits.

For LED current limiting, pull-up networks, and voltage dividers feeding a 10-bit ADC, ±5% tolerance is sufficient. A ±5% variation in a 220Ω LED resistor changes current by at most ±5%, a brightness difference invisible to the eye. Consequently, the Plusivo kit's ±1% parts provide no visible advantage in LED or pull-up applications over ±5% carbon film parts, but they also introduce no disadvantage, and having the tighter tolerance available means you can use the same kit for both hobby prototyping and precision analogue designs without maintaining two separate stocks.

Applications where the ±1% tolerance provides measurable benefit

Voltage dividers feeding a 12-bit or 16-bit ADC are the clearest case where ±1% tolerance matters, because a voltage divider with two ±5% resistors can produce a ratio error up to 10% in the worst case, while two ±1% resistors limit the worst-case ratio error to just 2%, and this twofold improvement in ratio accuracy is what separates a reliable precision measurement system from one that drifts noticeably across production units and temperature cycles; for a 12-bit ADC (4096 counts) measuring a 0–4.2V battery, a 10% divider ratio error shifts the reading by 400 counts, whereas a 2% error shifts it by only 82 counts, and precision audio equaliser networks, active filter cutoff frequencies, and op-amp gain networks all benefit similarly from the Plusivo kit's ±1% tolerance.

For Sallen-Key active filters where component tolerance directly shifts the cutoff frequency, the Plusivo kit's ±1% parts reduce the worst-case frequency deviation from ±5% to ±1%, keeping production units consistent without manual tuning or selection. The filter Q value benefits from the same ratio-error reduction, and pairing these tight-tolerance resistors with stable C0G or NP0 ceramic capacitors ensures the realised filter response stays within a few percent of the simulated design across the full operating temperature range.