RF Probe (T1691E)

This high-impedance probe for oscilloscopes was found in a July 1958 Radio Electronics magazine. The circuit did not include a power supply.

| Clique na imagem para ampliar |

Power Cut-off Protector (CB17463E)
This circuit, from 1999 documentation, prevents the powered device from receiving power when it...
Timed Voice Photo Relay (CB17041E)
This circuit is intended for monitoring an environment. It fires a relay with a sound, but only if...
Bilateral current source (CB7544E)
Found in a Popular Electronics from the 90's, this circuit uses integrated from that time, today...