Phone line controller
Phone line controllerIt might be “yet another” «device» controller that operates over phone-line, but this one works for sure The task was to build a device that connects to the phone line and has a relay as an output switch. It should also sense if the connected «consumer» is turned-on or off and report [...]
Power Amplifier 35W with LM391
Parts:R1-3-5-8-10=1Kohm C1=2.2uF 63V TR1=10K TrimmerR2-7-11=100Kohm C2=4.7uF 25V [...]
Telephone FM Transmitter
This FM transmitter attaches in series to one of your phone lines. When there is a signal on the line (that is, when you pick up the handset) the circuit will transmit the conversation. In particular it will radiate from the phone line itself. It is a passive device – there is no battery. It [...]
FM Transmitter for 88MHz to 108MHz
The important part of the circuit is formed of the Colpitts type oscillator. C3,C4,C5,C6,CD1-CD2 and L1 determines the frequency. BF982 and dual gate MOSFET are active parts in oscillator. When the input impedance of the MOSFET gate inputs are high, LC tank is not affected. However transistors force the LC tank and cause phase shift. [...]
Phono preamplifier
R1, R101 56 kOhm C1, C101 47 µF/6,3 V, elektrolyt.R2, R11, R102, R111, R16 12kOhm C2, C102 100 nF, fóliovýR3, R103 22 kOhm [...]
Power suply 5V 5A
Circuit power supply 5V 5A by 7805+Mj2955
This is circuit 7805+Mj2955 power supply 5V 5A for digital circuit.Q MJ2955 for to increase form IC 7805. Q A16 for overload protect.
Classic Audio Mixer
This is a classic signal mixer that is used for audio purpose. VR1 & VR2 are inputs audio volume controlers and VR3 is used to control the balance between Input1 and Input2. connect a dynamic microphone to Input1 and a music without vocal to Input2, then adjust the VR1, VR2 and VR3 for obtaining a [...]
AVR Thermometer TCN75
AVR Thermometer TCN75This small thermometer board uses the Microchip TCN75 device. It is a cheaper clone of the LM75, it costs about 2,50 Euro. The TCN75 comes in a SO8 packaging. The TCN75 is a serially programmable temperature sensor. It has an output that is programmable as either a simple comparator for thermostat operation or [...]
1W Linear FM Booster
This RF Amplifier is used for boosting small fm transmiters and bugs. It use two Philips 2N4427 and its power is about 1Watt. At the output you can drive any linear with BGY133 or BLY87 and so on. Its power supply has to give 500mA current at 12 Volts. More voltage can boost the distance [...]
10 Channel Chaser for 12V/60W lamps with PIC16F628A
This project allows instant start sequentially but a dozen low-voltage lamps 12 V / 60 W, and makes them fade and always sequentially (but slower). This system has been designed to meet the demand of a visitor who wanted ten recessed low voltage spot in a driveway to his house, with the following function: – [...]
Battery Level Indicator
This circuit allows switching on a LED when the battery voltage (12V) drops below a certain threshold. The operating system is based on a comparison of tension, which comes in a zener diode. If the supply voltage is 12V and the zener diode is a 10V model (this is the case in the diagram), we [...]
Timer from 1 to 999s with PIC16F84A
This is a good looking and practical device that can be useful in many areas where countdown timer is needed. This project is based on the PIC16F84A microcontroller. The time range can be adjusted between 1 and 999 seconds. This project has 3 buttons and one of them is named Set Button. In order to [...]
8 LED VU Meter Project
A VU meter is often included in audio equipment to display a signal level in Volume Units; the device is sometimes also called volume indicator (VI). In this project we are building a basic and low cost LED VU Metre circuit . The extent (range) display is -18 dBu to +3 dBu, spread over [...]
12 Channel LED Chaser with PIC16F84A
Today we have a new category “Projects” and a new electronic project 12 Channel LED Chaser with PIC16F84A.
This project is based on the popular PIC16f84A micro-controller.The heart of this project LED chaser is the PIC16F84A PIC microcontroller.A 4MHz crystal and capacitors C1 and C2 22pf is used for providing clock pulses to the micro-controller. The [...]
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