Tone Control with the TDA1524A (CB14579E)

The circuit below was suggested by the Motorola Linear Databook of 1990. The component used is uncommon and the power can be between 7.5 and 12 V.

| Clique na imagem para ampliar |

RS232 temperature interface (CB21278E)
Found in an Electronic Design from the 90's, this circuit uses common components. The circuit is...
Locked Light Relay (CB3868E)
When the sensor receives light, the relay closes its contacts and remains so even after the light...
90V Pulser (CB8838E)
This circuit produces pulses of 90 V at intervals that can reach 5 minutes. The circuit is from a...