Phonographic preamplifier (CB8249E)

This circuit was found in a Electronics World of 1968. The integrated circuit is the MC1320P from Motorola, uncommon today.

| Clique na imagem para ampliar |

ELF Monitor (CB21055E)
This circuit monitors extra-low frequency (ELF) fields. We found it in an American documentation from the...
Controlled Oscillator (CB12682E)
We can use any type of resistive transducer with central resistance in the range of 10 k ohms to 1...
Triac Double Dimmer (CB16915E)
This circuit controls two lamps so that when one increases in brightness the other decreases. The...