I need to convert a sine wave, from a crystal oscillator (14,31818Mhz) to a square wave, with the same frequency, to drive TTL Logic (74HCT*).
Tried to drive a bc547 into saturation, to get a clipped sinewave at the collector, which is connected to +5v with a pull up resistor. Doesn't work, grabbed a second one to get a darlington pair made of 2 bc547. Doesn't work either. I checked the datasheet, and according to me, it should be able to switch 100Mhz? Or am i wrong? BD 679 doesn't work either.
The sine wave is between 0 and about +5v (depends on the "load")....