I bought this to replace a broken sensor. It was simple to synch it with my existing clock and works perfectly.Get more detail about La Crosse Technology TX37U-IT 915 MHz Wireless Temperature Sensor. Read Full Story
Printed Circuit Board comprises of chips and other electronic elements placed on a slim plate. Popularly known as PCB, Printed Circuit Board Manufacturing is a highly skilled job and requires finest and minute details to be considered to avoid any sort of accidental danger. Printed Circuit Board Manufacturing is commonly used in computers in the form of motherboard, controller board, interface card etc. PCB is made of one or more layers. During PCB manufacturing, the section of conductors... Read Full Story
This is a circuit for project the FM circuit. Transmitter circuit described here has the additional RF power amplifier stage, after the oscillator stage, to increase the power output of 200-250 milliwatts. With a good matching 50-ohm ground plane antenna or multi-element antenna, this transmitter can provide a good enough signal strength to a distance of about 2 kilometers. Here’s the figure of the project circuit of the transmitter circuit. The circuit built around transistor T1 (BF494) is... Read Full Story
This product was a replacement, and it works, but the temperature is about 4 to 5 degrees lower than the actual outdoor temperature. The original one we had always registered the correct outdoor temperature.Get more detail about La Crosse Technology TX29U-IT 915 MHz Wireless Temperature Sensor. Read Full Story
By Steven S Wood Modern printed circuit board technology has led to a considerable reduction in conductor crossovers on different planes, resulting in a reduction in space requirements and increased packaging density of electronic components. However, the modern VLSI and other multi-pin configuration devices have tremendously increased the packaging density and consequently the concentration of inter-connecting lines. This has given rise to complex design problems such as noise, cross-talk... Read Full Story
This is a circuit for power amplifier and useful for audio. This circuit is work with based on transistor. Though the design is simple, these amplifiers have impressive performance, with a frequency response to approx 40 kHz, very low noise, reasonably fast slew rate, and approx 50 watts with the proper +/- 40 volt unregulated power supply. Here’s the figure of the circuit. Read Full Story
Here's a simple FM transmitter design. It uses pll circuit from Motorola MC145170. This PLL includes the prescaler and a serial standard bus called SPI. We advise to use the P2 version that fixes some init issues during the Power Up.
PLL FM Synthesizer
This PLL circuit is definitely smaller than the old one , consequently we've added on the radio board, the power control circuit that allows to switch on, the RF signal when the lock detect is established. In fact a simple LM317 that... Read Full Story
The circuit is very simple, it just has three transistors, but the transistor types have been changed for VHF/UHF transistors. You can use 2N2369, BSX19 or BSX20, or any small signal transistor with an “ft” of typically 400MHz or more. The transistor DC biasing is a little more tolerant to varying transistor types than the old V5 (FM)
TR1 is a simple audio transistor, such as the BC547, BC108, or 2N2222. This transistor provides absolutely no gain, but it inverts the video modulation... Read Full Story
This 30W RF amplifier circuit provides an appropriate power boost with an input of 4-6 watt operating on the VHF FM Broadcast Band with 88-108 MHz frequency. However, the circuit is very stable and provides a clean-output through 7 element Butterworth low-pass filter (LPF).
Circuit Explanation
This VHF RF power amplifier circuit uses 2SC1946A VHF RF power transistor . The transistor is specifically designed for operation in frequencies up to 175 MHz, with very good results.
As... Read Full Story
This RF power amplifier is based on the transistor 2SC1970 and 2N4427 . The output power is about 1.3W and the input driving power is 30-50mW. It will still get your RF signal quit far and I advice you to use a good 50 ohm resistor as dummy load. To tune this amplifier you can either use a power meter/wattmeter, SWR unit or you can do using a RF field meter .
RF Amplifier Assembly
Good grounding is very important in a RF system. I use bottom layer as Ground and I connect it with the... Read Full Story
