about 1 month ago - No comments
Another great quartz crystal oscillator schematic with bb139, a 2-nd harmonic quartz crystal and one BF214 transistor. So, the Q quartz is half of the desired transmitter frequency, L1 has 24 turns, 0.08mm Ø built on a 455kHz carcase. L2 has 8-9 turns / 0.8mm Ø / 5mm Ø. This quartz oscillator circuit has a More >
about 1 month ago - 2 comments
Here is a solar powered Flasher to scare away the nocturnal animals like bats and cats from the farm yard or premises of the house. The brilliant multicolored flashes confuse these animals and they avoid the hostile situation. It is fully automatic, turns on in the evening and turns off in the morning.
D.Mohan kumar
The More >
about 1 month ago - No comments
IC 4060 is an excellent integrated circuit for timing applications. Its ten active high outputs can give time delay from few seconds to hours. With a few components, it is easy to construct a simple but reliable time delay circuit
IC 4060 Design Note
D.Mohan kumar
IC 4060 is an Oscillator binary counter cum frequency divider. Its inbuilt More >
about 2 months ago - No comments
A very simple crystal quartz oscillator circuit schematic which use a quartz for frequency stability and a good rf tranzistor. Use a 2-nd or 3-rd harmonic crystal , for example if you want 100MHz use a 50MHz or 33.3MHz quartz or if you want use a 4-th harmonic crystal but the output rf voltage will More >
about 2 months ago - No comments
This simple circuit senses heat from electronic devices and gives warning alarm.
It is an ideal add on circuit to monitor heat in CD players, Amplifiers etc.
D.MOHAN KUMAR
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