nº1028

 

Mains voltage hot wire detector with piezoelectric speaker.

nº1027

 

Experimental reflex regenerative LW receiver (150kHz-250kHz), supply 3V

nº1026

 

Minimalist MW TRF radio receiver: 10mts wire antenna + PE; supply +5V_USB

 

nº1025

 

Led voltmeter(VCO); range 0-10V; 5 bipolar transistors; Yellow led flashes an amount of times equal to the input voltage; supply 12V