Five times the small signal
Set a non-inverting DC gain with two feedback resistors.
Difficulty: Breadboard. Estimated build time: about 30 minutes. 7-line bill of materials. Compare supplier offers when available. Build a low-speed, non-inverting amplifier that turns approximately 0.455 V into 2.27 V.
Prepare the bench
Use an isolated, regulated 5 V source with a 20 mA current limit and a digital voltmeter with approximately 10 MΩ input resistance. These are bench tools, not included in the shopping list. Disconnect power before changing connections. Confirm breadboard rail continuity and check for supply shorts before powering up.
Power and identify the IC
Use the TI LM358P in an 8-pin PDIP, viewed from above with the notch at the top. Pin 8 goes to +5 V and pin 4 to ground. Put 100 nF directly between pins 8 and 4. For the unused amplifier, connect pin 5 to Vin and pin 6 to pin 7; leave pin 7 otherwise unloaded. Do not substitute a different package without checking its drawing.
Set the input and feedback
Make Vin using 100 kΩ from +5 V to Vin and 10 kΩ from Vin to ground. Connect Vin to pin 3. Connect Rg = 10 kΩ from pin 2 to ground. Make Rf = 40 kΩ from two 20 kΩ resistors in series between pin 1 and pin 2. Do not connect their midpoint elsewhere.
Measure the ratio, not a promise
Measure Vin, then pin 1 to ground. Ideal gain is 1 + 40/10 = 5; 5/11 V input gives 25/11 V output. Real offset, input bias and resistor tolerance change the readings. Do not increase Vin toward 5 V: the LM358 input range and output swing do not reach both supply rails.