2N3819 | Electronic Project Circuits

Posts Tagged ‘2N3819’

10 minute time delay by fet 2N3819

This circuit is a basic function of the FET 2N3819, which acts as a switch. In the conduction and not conduction. It runs contrary to the transistor. The circuit can be used to delay the cycle is small. Such as delay, 9-volt light bulb, or motor delay to any DC 9 volts.
When raising the power supply circuit FET Q1 is running. D and S stand by the legs of furniture to the Tong Q1 will flow together, current flows through R2, so the flow from the legs through the leg and S. D, and through R4 to ground. So no current flows into R3 to transistor Q2 does not conduct. Resulting in a voltage appearing at the output is 12 volt, but when I press the S1 switch current flows into the capacitor C1 fully. Then go to the legs G of the FET. Q1 stopped working. Therefore, the current flowing through R2 is flowing to the R3 instead, and to bias transistor Q2 to work on the output transistor Q2 is not working out for 10 minute, because C1 is discharged. The S2 is the reset switch. By acting shock C1 to discharge out soon. That the time delay depends on the C1. If it will delay much longer, if less it will have less delay.

Be the first to comment - What do you think? Posted by admin - November 16, 2010 at 9:37 pm

Categories: Electronic Control, Timer Tags: 2N3819, fet switch circuit, Time Delay

simple audio mixer circuit with fet 2n3819

This circuit, a simple mixer circuit.It can mix two signal channels and one channel is output.Using a codec circuit,Convert stereo audio to mono audio time.
It can increase the number of channels too. By adding a VR1, R1 and C1 to the amount needed. Then connected to Buffett a new one.Most importantly is eating circuit current is very low.Can use with 9-volt batteries immediately.
When entering voice signal, one of input 1 and input 2. Audio is via C1 and C2 of each channel,served coupling signals to VR1 and VR2. To adjust the audio to the Fet Q1.Which it serves, including audio. Then expand signal the output pin S through C3 For coupling signal again, before leaving to the output.

Be the first to comment - What do you think? Posted by admin - September 13, 2010 at 11:22 pm

Categories: Audio diagram, Pre Amplifier, Tone control Tags: 2N3819, audio mixer, fet amp

Touch Switch using UJT 2N3819

This be Very Simple Touch Switch Circuit. It used UJT 2N3819 is Main part numbers should set up this outside building circuit. When stay far from electric line or Power Line very much. Enough touch at infront touch 1 metal and 2 make Relay work ON get. When but urgent touch 2 metals only make Relay stop work OFF get. For within a building must enhance the part mends or infront touch 3 metals with follow circuit picture. The Relay use 6V to 9V sizes and Volt supply use 6V to 9V levels all right sir. Request friends have fun Touch Switch using UJT 2N3819 , please sir.