https://falstad.com/circuit/circuitjs.html?ctz=CQAgjCAMB0l3BWKsBMBOAHANjQFixmihtgOwa4gDMaISuVdApgLRhgBQAbiG1pCDRZeYfiCyUBA3AJSSoyBBwBO1FLyrrN4XPJRLVfARJFjRCpQCMRGUiEptt7KRwDupgeaMb1kNx8FhbzBdKA4AY3BiHyiMHUpKMFh4FNS4MFY7KTD3J1CwaJDJf2DQvOKAZwCWbW0a33AQADMAQwAbCqZ-Oqdo+rCgA