74HC14 connect the output to input of one gate, the inputs of the other 5 to ground. Connect your LDR to Vc and the thing will oscillate as a current starved relaxation oscillator. ~60MHz max 74AC14 up to 180MHz ...all the way down to millivolts(Hz)
@@retireeelectronics2649 Instead or Rdson of the cmos FET's, you can pick resistance for much lower frequencies. Same with input capacitance, instead of ~5pf, add whatever you want. The nice feature is square law frequency vs voltage - decades wide.
The 'Look Mum No Computer" circuit diagram has the ground to the wrong side of the load. It will put some audio energyinto the speaker but only what the transistor takes off the capacitor that is rechharged through the resistor. This will have much slower edges and far reduced amplitude, hence the quietness. It was probably an honest mistake...
Totally agree, just one connection in the wrong spot. He has a great channel and if ever get over there I will visit his museum "This Museum is (NOT) Obsolete". Found his site, when looking at pipe organs. Have a good day
@@retireeelectronics2649 I made a fire fly in a bottle that flashed a white LED. That SMD should be very good for that with the Cap and Resistor hidden with the battery.
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74HC14 connect the output to input of one gate, the inputs of the other 5 to ground. Connect your LDR to Vc and the thing will oscillate as a current starved relaxation oscillator. ~60MHz max 74AC14 up to 180MHz ...all the way down to millivolts(Hz)
I will try that one out also. Nice thing with oscillators is you can either see the results (blinkies) or do these in audio range.
Have a good day
@@retireeelectronics2649 Instead or Rdson of the cmos FET's, you can pick resistance for much lower frequencies. Same with input capacitance, instead of ~5pf, add whatever you want. The nice feature is square law frequency vs voltage - decades wide.
The 'Look Mum No Computer" circuit diagram has the ground to the wrong side of the load. It will put some audio energyinto the speaker but only what the transistor takes off the capacitor that is rechharged through the resistor. This will have much slower edges and far reduced amplitude, hence the quietness.
It was probably an honest mistake...
Totally agree, just one connection in the wrong spot. He has a great channel and if ever get over there I will visit his museum "This Museum is (NOT) Obsolete". Found his site, when looking at pipe organs. Have a good day
S9018 will "strobe" at only 6 Volts, so you can use a 9 V battery, no problem.
I will try the S9018. Will be a real small circuit since the only S9018 I have is SMD (-:
Have a good day
@@retireeelectronics2649 I made a fire fly in a bottle that flashed a white LED. That SMD should be very good for that with the Cap and Resistor hidden with the battery.
Haven't seen a real fire fly in way to long of a time. Sounds like a good project to make and put in a tree (-: