How are radio frequencies and microwaves affecting bats?
A number of studies have been carried out to investigate the impact of radio frequencies and microwaves on wildlife. To date, results from studies carried out investigating the aversive effect of electromagnetic radiation on foraging bats have been largely unclear. Read more about this here.
What happens if you reverse the A and B battery connectors?
Worst of all, if you accidentally reversed the A and B battery connectors, you could fry your radio’s precious tubes. Recognizing these problems, radio makers, many of which also made and sold tubes, sought to develop battery-less radio sets. Perhaps more radio tubes could do part of the job of expensive disposable batteries.
What happens if the battery on my Radio goes dead?
A dead battery could leave you radio-less in the middle of a crucial broadcast. Lead acid cells could leak acid, which might drip out of the radio cabinet onto your lovely Persian rug. Worst of all, if you accidentally reversed the A and B battery connectors, you could fry your radio’s precious tubes.
What are the resistors in a bat detector?
FIGURE 2. Bat Detector Schematic. Resistors R3 and R4 were selected for high gain in IC1/a — consistent with acceptably low noise. The gain of IC1/b is set by R7 and R8. The latter was, in fact, selected to match the sensitivity of the microphone, given the high gain of IC1/a.
FIGURE 2. Bat Detector Schematic. Resistors R3 and R4 were selected for high gain in IC1/a — consistent with acceptably low noise. The gain of IC1/b is set by R7 and R8. The latter was, in fact, selected to match the sensitivity of the microphone, given the high gain of IC1/a.
What happens to batteries in an old radio?
Stacks of batteries disappeared and radios went from being pieces of lab equipment with many controls to adjust independently to the format we’ve retained today. Point the needle to the station on the dial and off you go.
What does it mean when your battery is reading 0 volts?
If your battery is: Reading 0 volts, chances are the battery experienced a short circuit Cannot reach higher than 10.5 volts when being charged, then the battery has a dead cell Fully charged (according to the battery charger) but the voltage is 12.4 or less, the battery is sulfated
What causes a false voltage reading on a battery?
Under the intense heat of the load, one or more of the weld pieces connecting the cells is coming loose and separating. This will cut the current, and voltage will drop. When the battery cools off, the pieces will touch, barely giving a complete connection. This gives you a false voltage reading.