We find this circuit in a 1980s Linear Technology documentation. The circuit can be implemented on the basis of more modern equivalent components.
August 2017 - The new IXYS solid state relay CPC2907B from IXYS is currently in stock at Mouser...
This three-chanel remote control transmitter uses a unijunction transistor as low frequency...
This one-digit TTL modulus for 7-segment display can be parto f digital projects. Many of them can be...