Voltage doubler for EEPROM programmer (CB9323E)

This circuit from the 90s, was found in an Electronic Design of the time. The components used are uncommon today.

Phase Shift Oscillator (MSB039B)
In this oscillator a phase shift network formed by C1, C2, C3 and R1, R3, R4 determine the fase...
RIAA Equalizing Preamplifier (CB4947E)
Indicated for vinyl media recovery, this circuit is from the 80's, having been found in an...
Frequency Deviation Indicator NE567 (CB12671E)
An interesting application that finds applications in industry, especially when fluctuations in...