Capacitor set – electrolytic

Preamble

The prices for electrolytic capacitor sets vary rather wildly.

Voltage Rating

The thing to remember, or to look for, is the voltage rating, as some kits come with 10 V capacitors (in particular the high capacitance 100 – 470 µF range), which aren’t much use in a 15V synth circuit, using CMOS 4000 logic ICs (although they would be OK in a 5V TTL circuit).

Rules of thumb

  1. Really it is best to get capacitors rated at twice the supply voltage (and round up to the nearest available capacitor rating), to be safe. So for 5 V use 10 V rated capacitors, for 12 V use 25 V rated capacitors, and for 15 V supply use 50 V rated capacitors.
  2. If you like living a little more dangerously, use a supply voltage between 2/3 to 3/4 of the voltage rating of the capacitor. So for 5 V use 10 V capacitors, 12 V use 16V capacitors, and for 15 V supply use 25 V capacitors

The only downside of using an over-rated capacitor is that a layer of oxide may develop within the capacitor.

Sources: Selecting voltage rate for capacitors and High Voltage Capacitor, in a low voltage system?

AliExpress is cheaper than eBay generally.

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