This circuit was found in documentation from the 1970s. However, it can be implemented with modern transistors such as 2N2222 for Q1 and BF494 for Q2. The crystal depends on the desired frequency.
This H-bridge shield circuit appears several times in applications in this section and on this...
This circuit can be used as a shield based on 555. The calculation of the timing network is done...
This circuit was obtained from a Popular Electronics of 1994. The magazine no longer exists in its...