741 200 mW Amplifier (CB25291E)

This general-purpose transistor audio amplifier was found in the March 1990 issue of Radio Electronics magazine. The power supply must be dual.

| Clique na imagem para ampliar |

Field Strength Meter (CB13267E)
We found this circuit in an old American publication. The transistors can be BC558 and diode 1N34....
Continuity Tester (CB15938E)
This simple circuit operates with only 1.5 volts of a battery and detects low resistance making a...
Divider by 4 with 4013 (CB16056E)
The cascade connection of two flip-flops allows division by 4, as shown in the figure. Note that...