24v

Found 2 Results for 24v.

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1. Variable-Frequency AC Power Supply
Occasionally you will want to test European appliances for their performance. Since most equipment from abroad will not operate as intended from standard American 60 Hz 115V outlets, a special power supply is needed for this task. This involves considerable expense which can be avoided by building a variable-frequency ac power supply. This device can produce the 50 Hz output at 115-120V for which most European appliances are designed, as well as provide the 400 Hz output necessary for many power tools. The key component in the circuit is an audio-frequency oscillator with a range of 0-400 Hz (Eico makes a kit suitable for this purpose) whose output is coupled by shielded cable to an audio amplifier. The amplified signal at 72W across 8 ohms places 24V ac across the secondary winding of the 120-24V stepdown transformer. When a load is connected to J (a standard European two-prong receptacle), 120V is induced into the primary. Adjustment of the audio-frequency oscillator to 50 Hz and of the volume control on the audio amplifier for 115-120V output (indicated on voltmeter V) creates the necessary power for foreign equipment.
http://www.fun-home-projects.com/electrical_projects/​tools/​variable_frequency_ac_power_supply.html

2. Rechargeable - Battery Tester
One of the more recent developments in home appliances is the "cordless" feature made possible by nickel-cadmium, sealed-cell, rechargeable batteries and some form of charging device. The charging device is usually a sealed unit which is serviced by direct replacement from the manufacturer, but it rarely is the culprit in battery-operated appliance problems. The most frequent cause of malfunction in these types of appliances is the battery itself. Either it has permanently lost its capacity to take a charge and must be replaced or it has suffered a temporary capacity loss as the result of improper charging procedure. Unfortunately, a low-voltage reading is insufficient to determine whether the loss is temporary or permanent and, as a result, the home-appliance repairman can hardly avoid inadvertently discharging many good batteries. Since the cost of these batteries is considerable it makes good sense to invest in a device which can determine the type of capacity loss, and one that is able to correct the loss should it be temporary. Temporary loss is usually the result of periodic, or "programed" charging sequences which may not be sufficient to counter the state of discharge in the battery. The rechargeable-battery tester corrects this condition by deep-discharging the battery several times and recharging to restore its original capacity. This series of deep-discharges and chargings takes about P/2 hours for the average battery and is fully automatic. If the battery is restored to full capacity, it is an indication of improper operating conditions with regard to the charging unit's ability to restore the battery to maximum capacity. Fitted with several small adapters, this handy unit is capable of testing a wide range of rechargeable batteries from the smallest 1.25V cell to 24V, 2A batteries.
http://www.fun-home-projects.com/electrical_projects/​tools/​rechargeable_battery_tester.html

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