This circuit is from an 80's publication. It makes use of small 6 V x 50 mA incandescent lamps. The diodes can be general purpose or even 1N4002. The transformer is 6.3 V with 100 mA or more current.
This telephone circuit was found on a 90's EDN. It keeps a flashing LED to indicate that there was a...
This basic operating configuration applies to types other than 741. The circuit does not require a...
The integrated circuit is the 4093 and one of its four gates is used. The frequency is given by...