The typical forward voltage of LEDs are 1.8V (red), 2.0V (yellow), 2.2V (green) and about 3V to 3.5V for blue. This means, that you can run all 3 red LEDs without any resistor, this rule applies to your LEDs. For more details, look at the datasheets, they will tell about the electrical characteristics. Add a comment.
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\$\begingroup\$ I made an LM317 regulator circuit to provide 4.2 V, however 1. it is a waste of energy 2. it needs a heatsink and can be quite bulky 3. I started to wonder - if the device turns on fine using the 5V provided on the charging port, and it is actually specified to 4.2V, then it might be able to run from 5V as well.
by Charles Clark Updated on April 2, 2023. There is no problem while using a 5v adapter to generate a 4.5v device. A device stating 4.5v actually can generally withstand a voltage appliance of a minimum of 5.5v. Hence there is no problem applying a 5v adapter to that specific device.
To estimate power supply needs, multiply the number of pixels by 20, then divide the result by 1,000 for the “rule of thumb” power supply rating in Amps. Or use 60 (instead of 20) if you want to guarantee an absolute margin of safety for all situations. For example: 60 NeoPixels × 20 mA ÷ 1,000 = 1.2 Amps minimum.
Supply Voltage (+/-Vs): The maximum voltage (positive and negative) that can be safely used to feed the op-amp. Dissipation (P d): The maximum power the op-amp is able to dissipate, by specified ambient temperature (500mW @ 80° C). Differential Input Voltage (V id): This is the maximum voltage that can be applied across the + and - inputs. A silicon diode has roughly a 0.65V drop. Putting it in series with the 4.95V from USB will get you close to 4.5V: simulate this circuit – Schematic created using CircuitLab. An LDO will also work, and will have better regulation (voltage will vary less with current) and could be closer to 4.5V. z6tlcbU.
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    • can i use 4.5 v instead of 5v