It only takes one mistake to realize electrolytic capacitors have a polarity, but if you’re working with old tube gear, tube amps, or any old equipment with those old orange dip, brown dip, or green ...

They should have at least sacrifice one capacitor, testing its polarities before soldering the whole roll of capacitors on the motherboards... Because if one is wrong polarity meaning the whole roll ...

A symmetrical ±5V power supply is often needed for small, battery-operated operational amplifier projects and analogue circuits. An IC that can easily be used for this purpose is the National ...