This small tube amplifier appeared in Radio Electronics magazine in February 1958. The circuit is powered by the mains with a power transformer and output with different impedances.
We found this circuit in a 1979 Poptronics. The circuit can be easily assembled with the use of...
Unlike the previous circuit this one trigger when the temperature drops below the set value. The...
A very interesting integrated circuit for step-down converter designs (voltage reducers) with an...