5VDC/33VDC converter.

I will propose DC/DC converter. for increase 5 VDC to High Voltage 33V. In circuit use 74HC04 Hex inverter rise to 50 V then to 2 zener diode 33V to protect and output High voltage 33 VDC.
A Project can use to supply the circuit using 33 VDC. Example TV tuner or VCR.
Next I'm measuring a signal in circuit...!

ISS school contact

Hear the sound from International Space Station. Today ISS school contact's schedule to contact to school in Malaysia. I'm set up my shack to listen on 145.800MHz with Icom 2200-T and 2 x dipole antenna. And second mobile with Omni Antenna for spare. Use HRD satelite Tracking for monitor. and live steaming to my channel (see the recorded as below)
From ISS is very loud and clear but some station in my country make a noise. So It's very good to hear

Low noise amplifier

Now introduce a low noise amplifier is a project. The project build for operate in Earth-Moon-Earth mode. It's use MMIC for amplifier the weak signal. MAX2611 is my selection. This IC has gain ~18dB at 144 MHz. In circuit is a simple design follow as data-sheet. Using an capacitor to filter Input and Output signal as I need to amplify. Until I measure, I think to do the redesign a circuit again. When I finish hope a improve a received weak signal from the moon.

Update L/C meter

After find more component for building the L/C meter design by VK3BHR. It can run until programed to MCU. Then supply 9VDC to board and adjust the Voltage for supply a contrast of display. I found the display has indicate "CALRIB", the program has running but its dos't continue to start. After problem occur I check the board what is wrong? Guess the problem is a relay pin isn't correct. I must go to shop again for get correct part for repair.