Circuit-Zone.com - Electronic Projects
Posted on Saturday, August 6, 2011 • Category: Test and Measurement
I wanted a digital AC voltmeter to measure the output range from 0 to 150VAC with reasonable accuracy. Sure I could buy some premade DVM packages or use a microcontroller with a built-in ADC, but I wanted to make one from scratch myself using readily available parts I had on hand. I aimed for reasonable accuracy so I chose to have a 2 and a half display for the voltage, meaning the meter reads from 000 to 199. Below is the schematic of the AC DVM.
Posted on Thursday, August 4, 2011 • Category: FM Transmitters
FM transmitter or often called fm transmitter uses 2 transistors in this article uses 2 transistors 2n2222. If the fm transmitter is in use voltage supply of 9 volt battery and use an antenna whose length is less than 12 inches, then this fm transmitter will be within FCC limits.
Signals from the microphone in the fm transmitter is reinforced by Q1, Q2 with carrier frequency generator is determined by the C5 and L1. The frequency of the FM transmitter is in the range 80 MHz - 108 MHz. L1 can be made with as many as 24 e-mail wire wrap and 6 wrap. The following is a picture series for the fm transmitter fm transmitter referred to in article 2 of this transistor.
Posted on Thursday, August 4, 2011 • Category: FM Radio / Receivers
FM Radio Receiver IC TDA 7012T is very simple, but Radio This FM receiver has good sensitivity and selectivity. Single Chip TDA 7012T FM Receiver is to build an FM receiver requires a few additional components.
Feature contained in FM receiver IC TDA 7012T is quite tempting to an FM receiver. Among features an FM receiver TDA 7012T is a low-voltage applications micro affability arrangement (MTS), Frequency Locked Loop (PLL) to 76 KHz range and selectivity of FM receiver with RC Filter. In an article by FM Radio Receiver IC TDA 7012T can be seen in the FM receiver circuit which can be made.
Posted on Wednesday, August 3, 2011 • Category: Test and Measurement
Here's hygrometer thermometer that simultaneously monitors both humidity and temperature on large LCD display which can be read from across the room. It's great for labs, chemical storage areas, clean rooms, stock rooms, warehouses, factories, greenhouses, and outdoors. Monitor humidity and temperature in your room, kitchen, desiccators, incubators, refrigerators, and fume hoods. Comes with AG13/LR44 battery. Temperature range -10 C to 50 C (14 F to 122 F). Humidity range 20% RH to 95% RH.
Posted on Monday, August 1, 2011 • Category: FM Transmitters
If you want to be independent of the local radio stations for testing VHF receivers, you need a frequency-modulated oscillator that covers the range of 89.5 to 108 MHz — but building such an oscillator using discrete components is not that easy. Maxim now has available a series of five integrated oscillator building blocks in the MAX260x series which cover the frequency range between 45 and 650 MHz. The only other thing you need is a suitable external coil, dimensioned for the midrange frequency.
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