Friday, March 27, 2015

Powerful AM Transmitter

This is the circuit diagram of powerful AM transmitter which use ceramic resonator/filter of 3.587 MHz. Resonators/filters of other frequencies such as 5.5 MHz, 7 MHz and 10.7 MHz may also be used. Use of different frequency filters/resonators will involve corresponding variation in the value of inductor used in the tank circuit of oscillator connected at the collector of transistor T1.

Saturday, June 21, 2014

1296 MHz RF Amplifier using NEC70083

Here the Radio Frequency (RF) amplifier circuit design for frequency 1296 MHz.

By using an NEC70083, this 1296-MHz amplifier delivers about 17-dB gain and around 1- to 1.5-dB noise. It is assembled on a G-10 epoxy fiberglass PC board. Use the layout shown because this is very important for correct performance.

Monday, June 16, 2014

UHF Signal Amplifier for TV

This is the circuit diagram of UHF Signal Amplifier for television device. It uses single transistor 2SC3358 as the main signal amplifiication component.