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Wifi VSWR Meter
When building antennas for the WiFi band such as the 8dBi omni, the need quickly arises to test these antennas in a simple manner
post 21 Apr 2024
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Opto Coupler for Keying
ith an opto coupler component 4N25 and the circuit in FIG.1, we have excellent isolation between transceiver and computer, because there is not any undesirable "ground loop" between TX & PC
PIC-Keyer
This project describes the construction of a real "QRP" keyer with a small microcontroller PIC 16F84, with slightly modified hardware also PIC16F62
Power Supply for small tube amplifiers
For tube amplifiers, independent if HF or AF, it is more difficult to find 50 Hz transformers with appropriate output voltages for a reasonable price
Programmatore seriale per PIC
Collegato ad un computer permette tramite apposito software di trasferire un programma
170
ith an opto coupler component 4N25 and the circuit in FIG.1, we have excellent isolation between transceiver and computer, because there is not any undesirable "ground loop" between TX & PC
This project describes the construction of a real "QRP" keyer with a small microcontroller PIC 16F84, with slightly modified hardware also PIC16F62
For tube amplifiers, independent if HF or AF, it is more difficult to find 50 Hz transformers with appropriate output voltages for a reasonable price
Collegato ad un computer permette tramite apposito software di trasferire un programma
23cm Yagi Antenna building Finished antenna at 1275 MHz SWR under 1:1.5 at resonant frequency
50 MHz preamp Gain 26dB with the BFG135 Preamps for 144 and 430 MHz, for 50 MHz, the BFG135a is a cheap transistor and in my view rather strong. It is not easily damaged by static discharge or RF power. FG connection
30 Volt Computer Power Supply Stack A bonus was that i discovered that these did not need a standby load connected to the supply to keep them running just apply mains power and close the Start lead to ground