Showing posts with label volt. Show all posts
Showing posts with label volt. Show all posts
Sunday, 26 February 2017
Audio Milli Volt Meter Circuit Diagram
Build a simple audio Milli volt meter circuit diagram. This Audio Milli Volt Meter Circuit has a flat response from 8Hz to 50 kHz at -3 db on tbe 10-mV range. The upper limit remains the same on tbe less sensitive ranges, but the lower frequency limit covers under 1 Hz.
Simple Audio Milli Volt Meter Circuit Diagram
Sourced By : http://circuitsdiagram-lab.blogspot.com/2013/11/simple-audio-milli-volt-meter-circuit.html
Saturday, 17 December 2016
Simple12 volt Cellar Drain Pump
This is a simple Electronic Circuit Project of 12-volt Cellar Drain Pump. This circuit lets you control a pump, to keep the level of water in a cellar below a certain threshold, for example. Power is supplied to the pump by a battery that is recharged auto matically when the AC power line voltage is present.
12-volt Cellar Drain Pump Circuit Diagram:
lf the water level rises, the electrodes touch the liquid and a current begins to flow. The transistor then conducts and the pump runs. The pump stops when the water level has dropped sufficiently for the electrodes to no longer be in contact with it but not straight away, as the voltage on the transistor gate is maintained for a few seconds more by the 470 ytF capacitor. This makes it possible to ensure the electrodes are completely clear of the water.
The battery is constantly tested by the comparator circuit around the T1071 lC. lts output drives the gate of the triac in the transformer primary circuit via the optoisolator. The transformer secondary charges the battery via the rectifier, using as little power as possible, and in this way keeps the battery at 13.2 V.
12-volt Cellar Drain Pump Circuit Diagram:
lf the water level rises, the electrodes touch the liquid and a current begins to flow. The transistor then conducts and the pump runs. The pump stops when the water level has dropped sufficiently for the electrodes to no longer be in contact with it but not straight away, as the voltage on the transistor gate is maintained for a few seconds more by the 470 ytF capacitor. This makes it possible to ensure the electrodes are completely clear of the water.
The battery is constantly tested by the comparator circuit around the T1071 lC. lts output drives the gate of the triac in the transformer primary circuit via the optoisolator. The transformer secondary charges the battery via the rectifier, using as little power as possible, and in this way keeps the battery at 13.2 V.
Sunday, 4 December 2016
Simple 12 to 120 Volt Inverter Circuit Diagram
This is the simple 12 to 120 Volt Inverter Circuit Diagram. Ever needed a low power 120volt AC power source for your car, van or truck? Well this circuit should do the trick for you. It will supply 15 watts of AC power to a device. It should power lamps, shavers, small stereos and small appliances. If you draw to much power the circuit will shut down all by itself.
The output of this circuit is a square wave so there may be some noticeable hum on audio units plugged into it. To reduce some of the hum increase the value of the output capacitor which is at .47uf now. That transistor in the circuit are high power PNP transistors. Radio Shack part number 276-2025 are good ones to use or TIP32. The transformer is a 24 volt 2 amp center tapped secondary Radio Shack part number 273-1512 or equivalent.
12 to 120 Volt Inverter Circuit Diagram
Tuesday, 22 November 2016
Precision Audio Milli volt meter Circuits Diagram
This electronic circuit is audio milivolt meter. It measures 10mV to 50Volt RMS in eight ranges.
Precision Audio Millivoltmeter Circuits Diagram
Notes:
Precision Audio Millivoltmeter Circuits Diagram
Notes:
- Connect J2 and J3 to an Avo-meter set to 50µA range:
- Switching SW2 the four input ranges will be multiplied by 5
- Total fsd ranges are: 10mV, 50mV, 100mV, 500mV, 1V, 5V, 10V, 50V
- Set R11 to read 1V in the 1V range, with a sine wave input of 1V @ 1KHz
- Compare the reading with that of another known precision Millivoltmeter or with an oscilloscope.
- The oscilloscope reading must be a sinewave of 2.828V peak to peak amplitude
- Frequency response is flat in the 20Hz-20KHz range
- If you have difficulties in finding resistor values for R1, R2, R3 & R4, you can use the following trick:
R1 = 10M + 1M in parallel
R2 = 1M + 100K in parallel
R3 = 100K + 10K in parallel
R4 = 1K2 + 6K8 in parallel
All resistors 1/4W 1% tolerance
Parts:
R1_____909K 1/2W 1% Metal Oxide ResistorR2______90K9 1/2W 1% Metal Oxide ResistorR3_______9K09 1/2W 1% Metal Oxide ResistorR4_______1K01 1/2W 1% Metal Oxide ResistorR5_____100K 1/4W ResistorR6_______2M2 1/4W ResistorR7______82K 1/4W ResistorR8______12K 1/4W ResistorR9_______1K2 1/4W ResistorR10______3K3 1/4W ResistorR11____200R 1/2W Trimmer Cermet
C1_____330nF 63V Polyester CapacitorC2,C3__100µF 25V Electrolytic Capacitor
C4_____220µF 25V Electrolytic CapacitorC5______33pF 63V Polystyrene CapacitorC6_______2µ2 63V Electrolytic CapacitorD1-D4___1N4148 75V 150mA Diodes IC1_____CA3140 Op-amp
IC2_____CA3130 Op-amp
SW1_____2 poles 5 ways rotary switch
SW2_____SPDT switch
J1______RCA audio input socket
J2,J3___4mm. output socketsB1______9V PP3 Battery
Clip for PP3 Battery
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