This circuit is from the time when slide projects were used. We find it in a 90's Wels’ Think Tank. The lead times can be adjusted from 5 to 30 seconds.
This circuit keeps the neon lamp on for a moment when it receives a pulse. The turn on time...
This circuit was obtained from an English magazine from 1976. What this circuit does is start from...
We found this amplifier in a publication of 1990, but it can be mounted today with some exchanged...