CW Monitor (CB21439E)

This circuit for monitoring telegraphy transmissions was found in a 1975 CQ magazine. Transistors may be modern equivalents.

| Clique na imagem para ampliar |

Variable Power Source 1.2V - 25V x 3 A (CB13012E)
The power supply shown in the figure provides output voltages in the range of 1.2 to 25 V with...
0 to 250 V x 1A Power Supply (CB19130E)
The components used in this regulator project from an old documentation are not very common today....
Alternating Flasher LM3909 (CB14281E)
The circuit shown in the figure makes use of an LM3909, a low consumption and low voltage IC. The...