Rumble filter (CB6541E)

This turntable filter was found on an 80's Elektor. The circuit makes use of operational features that are easily obtainable today.

| Clique na imagem para ampliar |

Multi-voltage source (CB1574E
The circuit of the figure can provide voltages of 5, 8.9 and 12.5 V at its output, all doing this...
Fan Control II (CB15517E)
What differentiates the CIR8139 circuit is the use of two inverter ports to trigger the transistor that...
Step Generator 555 (CB11407E)
This circuit generates slow interval steps for controlling stepper motors. The circuit has two...