[Ronja] Testing switching time of an LED

[Gullik Webjörn]

I have used a single 74HC14 or 74AC14 or 74LVC14 inverter with a simple
resistor between input and output
and a small variable or fixed capacitor between input and ground. These
oscillators are described in the
data sheets. The single inverter drives remaining 5 inverters in parallell
aka ronja driver, and their output
to a resistor and then the LED under test. You can build this test ckt in 3
minutes.

To measure, just use a pin diode, with a 50 ohm resistor close to the scope
input. Anode to 50 ohm,
cathode decoupled with 10 nF to ground, 5 V or so for bias.

Gullik
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