Crystal low frequency oscillator (CB7533E)

Found in an RF Design from the 90's this circuit is intended for crystals of less than 1 MHz. Transistors are types of general use today.

| Clique na imagem para ampliar |

RIAA Preamplifier III (CB958E)
This circuit was adapted from an Italian publication that no longer exists. This is “Onda Quadra”...
Linear thermometer (CB9359E)
This circuit was obtained in an Electronic Engineering of the 90s. The operational amplifiers and...
Alarm with lock (CB8973E)
The basic component of this circuit is a general-purpose SCR. The voltage is according to the...