The ADC801 is not an easy component to obtain today, but the configuration is worth reference. The circuit is from National Semiconductor's Linear Applications Handbook.
This astable multivibrator using two transistor controls two small 50 mA lamps. The lamps can be...
This analog telephone line extension circuit monitors when the line is in use. We found it in the...
This circuit comes from a Gernsback Publications of the 90s. The circuit uses a general-purpose transistor as...