We found this circuit in the Linear Applications Handbook by National Semiconductor. It uses the LM3900, an operational transconductance amplifier as a base. Q1 can be a 2N2222 or similar.
This circuit was published in an English magazine from 1980. The magazine no longer exists, but...
This circuit, from the ON Semiconductor Thyristor Manual, controls both the speed and direction of...
Other settings like this can be found on this website. This makes use of old operational...