741 Filter (CB24265E)

The 1 kHz tuned filter shown uses a 741 op-amp. The components can be re-scaled to suit the desired frequency.

PUT Low Voltage Flasher (CB4252E)
This PUT (Unijunction Programmable Transistor) configuration was found in an 80s ON Semiconductor...
Timer 555 C (CB16609E)
This is a traditional double timer configuration with the 555 found in a 1987 documentation. The...
5 W TDA1905 Amplifier with Simple Tone Control (CB15224E)
This circuit has a two-position tone control providing a power that reaches 5 W. The supply...