This circuit was obtained in a 90s Popular Electronics. It is used for tuning on AM radios. The field effect transistors used support equivalents.
In the figure we have a interfacing circuit of TTL logic as CMOS logic using a 6N139 optical...
This circuit is used to match a high impedance input source with a low impedance output device...
This combination key or code key was found in old documentation. The consumption is very low, and...