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April 13, 2010
The electrical diagram of a small portable MW radio receiver, reproduction being done over the headphones [more]
April 13, 2010
In HF amplifier the signal coming from the radio station is being amplified in its original form. In our case, this means that AM signal is led at input of the HF amplifier, and on... [more]
April 13, 2010
Listening the programme over the headphones has its advantages, but the true radio receiver is certainly the one that with the loudspeaker. In this project the simplest such receiver is being described, consisting of input... [more]
April 13, 2010
The Simplest Amplified AM Radio Receiver [more]
April 11, 2010
This small thermostat allows you to select the size of its hysteresis. You can set both the temperature at which the relay will energize - and the temperature at which the relay will de-energize. The... [more]
April 11, 2010
These two circuits use Thermistors (Temperature Dependent Resistors). Circuit No.1 energizes the relay when the temperature rises above a preset level. Use it to switch things on when it gets hot. Circuit No.2 energizes the... [more]
April 11, 2010
These two circuits use LDRs (Light Dependent Resistors). Circuit No.1 energizes the relay when the light rises above a preset level. Use it to switch things on at dawn. Circuit No.2 energizes the relay when... [more]
April 11, 2010
These circuits combine a buzzer with one or more LED displays. When the push switch is operated - the buzzer will sound and the LEDs will flash. When the switch is released - the buzzer... [more]
April 11, 2010
Flashing LEDs can be used to create the impression that an alarm has been fitted. Or they can be used in conjunction with a real alarm - to warn-off a potential thief. These three small... [more]
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