With the capacitor used, this circuit provides delays of 40 to 60 seconds. Larger capacitors can be used, and the SCR supports an equivalent. The circuit is from the 1977 RC semiconductor manual.
This circuit uses the flip-flops from the previous circuit to implement a 3-digit binary counter. The...
The voltage comparator used in this application is the NCX2220 from NXP. What this circuit does is...
The UVTRON tube is an ultraviolet radiation sensor. In this circuit from Radio Electronics from...