To build and repair electronic equipment needs generators low and high frequencies. A simple device, a scheme which offers the British magazine “Radio Electronics Constructor”, replace them at first. The single junction transistor V1 performs the functions of the relaxer. The value of resistor R1 and capacitor C1 determine the value of the audio frequency (about 1 kHz). It change the selection of capacitor C1. Using an isolating capacitor C3 of the low-frequency signal is supplied to the output socket. And since it has a sawtooth form, that contains a large number of higher harmonics.COMBO GENERATOR
To build and repair electronic equipment needs generators low and high frequencies. A simple device, a scheme which offers the British magazine “Radio Electronics Constructor”, replace them at first. The single junction transistor V1 performs the functions of the relaxer. The value of resistor R1 and capacitor C1 determine the value of the audio frequency (about 1 kHz). It change the selection of capacitor C1. Using an isolating capacitor C3 of the low-frequency signal is supplied to the output socket. And since it has a sawtooth form, that contains a large number of higher harmonics.
DEVICE FOR CHARGING BATTERIES is a rectifier device with electronic current regulator (Fig. 1). A rectifier manufactured by bridge circuit of diodes V1 — V4 (Fig. 2), and the electronic controller a current amplifier transistor V5. The necessary adjustment select using the divider resistors R2, RZ, providing current from 4 to 6 And at a voltage of 8-15 V.
When the firebox of the fireplace or stoves in the country wood raw material to the combustion process from time to time it is necessary to control: throw the wood, increase craving, etc. to Replace “master’s eye” and recall this can offer an electronic device indicating the reducing flame in the furnace (the furnace).
In the process of operation acid batteries gradually sulfation of the plates which reduce capacity and shorten the life of the device. To eliminate this undesirable phenomenon, a special rectifier. The device is intended for use in stationary and field of auto repair shops. Collect it, you the driver with basic knowledge in electrical and electronics.
Flashing beacons are used in electronic home security systems and in cars as devices of indication, alarm and warning. Moreover, their appearance and “stuffing” are often not distinguished from beacons (special signals) emergency and operational services.
Change arrow indicators the dog often come led. And this is not surprising: the second is much easier and safer first. Simple five-level scheme of the AF voltmeter to the voltage of 0.1—0.6 volts, where the indicators are LEDs, published in the journal “Рипката1ег” (GDR). If the signal fed into socket x2, XS, the voltage exceeds 0.1 V, open transistors V2, V4 and, as a result, the led turns on Q1. With an increase of the signal to 0.2 In open semiconductor triode V6 and the led flashes B2. When the signal voltage reaches about 0.6 V, burn all the LEDs.
Recently, widespread quartz alarm clock made in China, characterized by a relatively high ring volume and cheapness. If the watch is out of order, but the alarm clock still works, it can be used in a variety of makeshift structures. For example, the proposed indicator of a bite.
Protection of your house and garden from small rodents, insects relevant today. Various industrial devices “repellents” are on sale, but this same device is able to produce hams with a medium level of training. Unlike many schemes of such devices listed below are quite original. Known schemes are based on the ultrasonic frequency generator (uzch), “loaded” to the piezoelectric capsule. The frequency of these generators can be tailored (adjusted by changing the values of the RC circuit), but it is invariant under the operation of the device, and therefore of the generator. That is, any rodents, insects, birds or animals would not be “programmed” generator uzch (all of these entities are afraid of the discomfort of pulses of a certain frequency), over time, the device ceases to be effective due to rodents or insects exposure.