18W FM Transmitter
L1 3 Vueltas sobre ferrite de 5×10mm
L2 3 Vueltas sobre aire de 9mm (largo 10mm)
L3 1 Vuelta sobre aire de 12mm
L4 4 Vueltas sobre aire de 9mm (largo 12mm)
L5 2.5 Vueltas sobre ferrite de 5×10mm
L6 1 Vuelta sobre aire de 12mm
L7 2.5 Vueltas sobre ferrite tipo HF de 10×5mm
L8 3 Vueltas sobre aire [...]
7W Fm Transmitter
Q1 NPN MPS3904 Transistor
Q2 PNP MPS2907 Transistor
Q3 NPN MPS2222A Transistor
Q4 NTE342 (cross reference 2SC1971)
L1 & L2 are air-core coils…8mm diameter…3 turn wrap…1 turn tap (L1 is tapped one full turn from the diode side (D1) of the coil…L2 is tapped one full turn from the collector side of the MPS222A transistor) using un-insulated 18 [...]
FM Bug Transmitter
The Circuit shown can transmit voice to exceptionally good range. Tune trimmer to hear the signal to your near radio. Frequency range is 88-108 MHz. Max current consumption is 30mA.
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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