4-scale millivoltmeter (CB7389E)

Found in Radio Electronics from the 90's, this circuit can be implemented with other operational amplifiers. The power supply is symmetrical.

| Clique na imagem para ampliar |

3-Transistor Radio (CB21641E)
Found in the July 1968 Supertena Bulletin of a Popular Electronics, this receiver makes use of the...
Switched Power Supply from 4.5 to 30 V x 6 A (CB13505E)
This switching source was obtained in a 1976 National Semiconductor manual. For the indicated...
Crystal Oscillator LM339 (CB17388E)
This configuration appears several times on this site. The circuit can generate a 100 kHz or other...