This circuit was obtained in a Hands-On Electronics from the 90's. The circuit turns on one LED at the end of the timer, erasing the other. The timing can be increased by increasing C1.
The output current for this source depends on the voltage applied to the input. The operational...
This Philips circuit of the 70's makes use of components of the time. The DZD40 is an uncommon...
The unijunction transistor for this circuit, found in a 1976 publication, may be 2N2646. The...