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- If you can't have the parts you want to use, use the parts you have
- I don't quite understand, why couldn't you float your op-amp power supplies to be centered around the 30 volt level? Or use two resistors and a -30 volt power supply to translate the signal to be near zero?
- Limitless gain
- Circuits like these often need extensive decoupling networks in the Vcc feeds and careful shielding and layout. At the very least 0.22uF capacitors on the tops of the 1K resistors, then 100 ohm resistors to Vcc.
- Teardown: Reverse engineering an ultrasonic cleaner
- I would check the diodes, then the PS capacitors, then the transistors.
- Keep on truckin’
- I'd suggest finding another antenna supplier. The whole point of an antenna is to be the right length or ballasted with a loading coil or capacitor to appear the right length to get a low VSWR. If they silently added a loading coil into the base, that's first off a bad idea, as it increases losses. Then not retuning the antenna for you was their second mistake. And making changes is probably not allowed by your contract. Jeez, we have gotten notifications when IC manufacturers change factory locations, or change form gold to copper bond wires, neither of which changes we could ever detect. And of course as a ham I have to wonder where these trucks are being used that they are capable of overrunning the 2-meter ham band. Underground mining? At the South pole?