Electron counter
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- 'typ: 2fA', no mention of input cap: LMC662AIM, farnell 9494790 (soic+dip)
- 'typ 1pA', input cap 6pF:MCP6474farnell 2348035
- 'typ .5pA',
Een electron op 1pF: 0.16 uV; input noise 1kHz: 5.1 V/Hz^.5: opa2140, farnell 2124895