Electronics > Beginners
Portable Low Frequency square wave generator circuit - Solved - page 3
Laszlo:
Had a look at the TLE5206, it is more expensive than the 555, but probably it will last longer. So far the circuit still works, but I have my doubts whether it will still be functioning after extensive use. If nothing else I will probably go with your solution.
Simon:
Yes it's a fully qualified auto part.
StillTrying:
If the receiver is happy to except 6 to 12V +/- narrow pulses as input, I be tempted to try just +/- 9V pulses from a single 9V battery, to get rid of the 18 to 12V power supply. :)
Simon:
I thought it was 12Vpp ? the 555 will do 15-18V so only really good for 12V. The other option on the cheap is a totem pole with a high side NPN and low side PNP, but this is not short circuit protected.
Laszlo:
--- Quote from: Simon on May 29, 2019, 04:38:47 pm ---I thought it was 12Vpp ? the 555 will do 15-18V so only really good for 12V. The other option on the cheap is a totem pole with a high side NPN and low side PNP, but this is not short circuit protected.
--- End quote ---
I actually looked at the totem pole option, but never really dealt with it before and I wasn't confident enough to try building it.
--- Quote from: StillTrying on May 29, 2019, 04:02:03 pm ---If the receiver is happy to except 6 to 12V +/- narrow pulses as input, I be tempted to try just +/- 9V pulses from a single 9V battery, to get rid of the 18 to 12V power supply. :)
--- End quote ---
Back in the olden days, when the original wheel-slip protection rack was built they used just that. I've seen the schematics of that actual test kit, but it was using two op-amps and 2 transistors to generate the waveform required, it was also being supplied by two 9V batteries. The only problem is that due to the age of the rig I'd rather not risk load it too much. I don't think my superiors would be particularly impressed if I manage to fry one of these with my homemade device :)
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