Panel switch wiring

Showing posts with label transistor. Show all posts

Thursday, August 28, 2014

FM Transmitter with two Transistor

A lot of FM transmitter circuits accept been already appear here. This just addition one, a simple two transistor FM transmitter. The aboriginal date of the circuit is a preamplifier date based on transistor Q1. This is a beneficiary to abject biased amplifier date area resistor R2 sets the beneficiary accepted and R1 provided the all-important beneficiary to abject bias. C1 is the ascribe DC decoupling capacitor which couples the ascribe audio arresting to the Q1 base. C8 is the ability accumulation by-pass capacitor.

Next date is the oscillator cum modulator date congenital about transistor Q2. Electrolytic capacitor C2 couples the achievement of the aboriginal date to the additional stage. R3 and R4 are the biasing resistors of Q2. R5 is the emitter resistor of Q2. Inductor L1 and trimmer capacitor C5 forms the catchbasin ambit which is all-important for creating oscillations. The articulate FM arresting is accessible at the beneficiary of Q2 and it is accompanying to the antenna application capacitor C9.

Notes.

The circuit can be powered from anything between 6 to 12V DC.
Using battery for powering the circuit will improve the performance and reduce noise.
A 9V PP3 battery is a good option.
If you are going with a battery eliminator, then it must be well filtered and regulated.
Trimmer C5 can be used for adjusting the transmission frequency.
Antenna can be a 1m copper wire.
L1 can be constructed my making 4 turns of 1mm enameled copper wire on a 10mm diameter plastic former.
Trimmer capacitor C6 can be adjusted for obtaining the maximum range.
Most of the components required for this circuit can be procured from your junk box.

Tuesday, August 26, 2014

2 Transistor Electronic Siren Wiring diagram Schematic

This is the electronic siren schematic diagram which used 2 transistor BC547 and BC557. The siren is powered by 9V battery or power supply adapter and use 8 ohm speaker to produce the sound. The siren is controlled by the touch plate switch. If you touch the plate, then this electronic siren will be activated.

2 Transistor Electronic Siren Circuit Diagram

Friday, August 22, 2014

2SC5200 and 2SA1943 high fidelity power transistor

Here are two transistors manufactured by Toshiba. 2SC5200 and 2SA1943 transistor pair has been widely applied or used in the amplifier power amplifier because the transistor has a large power, and also not too expensive than other large power transistors. This transistor has the advantage of High breakdown voltage: VCEO = 230 V (min), Suitable for use in 100-W high fidelity audio amplifiers output stage. For more information, please see datasheet below.

Maximum Ratings (Tc = 25°C)

Electrical Characteristics (Tc = 25°C)

Friday, August 15, 2014

Single transistor radio

Here is the schema diagram of a simple radio that uses one transistor and few other passive components.The C6 and L1 forms a tank schema which picks up the signal from your desired radio station.Diode D1, capacitor C2 and resistor R1 does the detection of the picked signal.The detected signal is coupled to the base of Q1 through capacitor C3.The Q1 gives required amplification to the signal.The resistor R2 is used to bias Q1.R3 limits the collector current of Q1.The audio output will be available at the collector of Q1 and it can be heard by using a high impedance head phone.This radio will work only at places where there is reasonable radio signal strength.

Notes.

* Assemble the schema on a general purpose PCB.
* The schema can be powered from a 3V battery.
* The antenna can be a 1 M long wire.
* The headphone must be a high impedance(2 to 3K) type.
* If diode AA121 is not available you can use AA112, AA116 or 1N34.
* The inductor L1 must be a 0.35mH, center tapped one.
* The radio can be tuned by adjusting the variable capacitor C6.