This circuit of a 1969 Electronic Design uses RTL logic. The setting can be adapted to TTL. The frequency is given by the crystal.
This 3 V rail to rail buffer was found in a National Semiconductor documentation. The gain is unit....
This charger provides a current of 20 mA under voltage of 9.6 V for charging batteries. Two...
Two operational amplifiers like the 741 or equivalent are used in this voltage-controlled...