vhf ampand transmiter schematic


Posted on Feb 6, 2014

Another version of the 1W VHF amplifier for the FM transceiver, well, in fact, it`s still the same version since I didn`t managed to get 1W. YET! Today I made some tests with a 2n2553 and a 2n2866. it melted solder in one of the base resistors (never I had seen such a thing, normaly resistors burn), a 27 Ohm one, made with 3 different resistor. but the power was: 1. 6mW thats mili!


vhf ampand transmiter schematic
Click here to download the full size of the above Circuit.

So I still have to learn a little more on VHF amplification. 2 more 2n3553 went belly up. it`s always the emiter junction that breaks :) Anyhow, Pedro - CT5JZX, today sent me a schematic he found for me to have a look and get some ideas! Funny, it`s basically the same schematic I use on the transmitting part, that`s normal, most parts of my schematic came from Miguel - PY2OHH site. VHF oscilator buffer (BFR91 with 100k to base): I have two, one for the PLL and the other for the output amp part. Both connect to the same place via DC decoupling caps.




Leave Comment

characters left:

New Circuits

.

 


Popular Circuits

Audio peak Indicator
Electronic light flasher
Low-power inverter using LM555 Timer IC
Switching Power Supply
converter r2elhc600a 10v
Keep The Ramp right
Oscillator Simulation Example Using RINCON
Hybrid Headphone Amplifier
Optical Pulse Generator
Ensemble RX Builders
Quick-Charge Auto-Fire Flash Circuit
Voice remote control switch circuit
AD524J type thermocouple cold junction temperature compensation circuit



Top