his tutorial is for making simplest FM transmitter using one transistor. VC1 is a small, screw-adjustable, trimmer capacitor and its rating should be around 10-100pF. Set your FM receiver for a clear, blank station. Then, with a non-conductive tool, adjust the capacitor for the clearest reception, rotate it till the receiver receives a sound from the microphone of transmitter. Use the following formula for determining the frequency.
ou need following components for this experiment:
. Capacitors- 4.7pF, 20pF, 0.001uF, 22nF.
0.001uF has code 102 and 22nF has code 223.
or VC1 you can use a trimmer capacitor that looks like this:
Source: Question vs Answer
Repair Kit, Acer X223W, LCD Monitor, Capacitors Only, Not the Entire Board
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Need help with a 555 Timer2010-11-28 05:01:17 by sciencegy
I am trying to set up a simple circuit using a 555 Timer integrated chip to send out a single pulse for 1 second. To test the circuit, I am using an LED. Rather than blink for 1 second and go off, it stay on.
The circuit was set up in monostable mode using the manufacturer's data sheet at A 1000 Ohm resistor and a 1000 microfarad capacitor were used...th the other end to a common ground. There was no detectable difference)
Pin 6 Threshold
Pin 7 Discharge (6 and 7 are tied together as in the schematic on the manufacturer's data sheet)
Pin 8 + side of battery input
THE QUESTION: Why is the output staying on, and how do I make it give one 1 sec pulse, turn off, and stay off?
Thanks for any solutions you may have. :)
BCP56 Transistor NPN 80V 1A SOT-223-3 BCP56T1G
BISS (On Semiconductor)