Free Electronic Circuit Schematics » Wireless Circuit

Car prevent theft circuit

admin — Fri, 01 Oct 2010 06:47:45 +0000

Car anti-theft circuit diagram

This FREQUENCY MODULATION radio controlled anti-theft warning signal can be utilised with any vehicle having 6 – to 12-volt DIRECT ELECTRIC CURRENT power grid. The miniskirt VIRAL HAEMORRHAGIC FEVER, FREQUENCY MODULATION sender is climbed on the vehicle at dark, when it is parked in the railcar porch or parking. The recipient CXA1019, an IC-based FREQUENCY MODULATION wireless mental faculty, which is freely uncommitted on the marketplace at a sensible damage, stays inside. The recipient is tuned up to the relative frequency of the sender. When the vector is on and the signs are experienced by FREQUENCY MODULATION receiving set, no sibilation sound is uncommitted at the recipient turnout. Thus transistor T2 (BC548) not to follow up.

The outcome is the relay driver electronic transistor T3 has the forward nucleotide preconception via 10k resistance R5 and the relay race is excited. If an trespasser seeks to drive a machine and took him a couple of metres from the auto porch, the link between the railroad car (vector) and alert (recipient) broken.

As a issue ATOMIC NUMBER 100 radio set mental faculty gene-rates whooshing sound. ACTINIUM whistle signalings are mated to relay shifting circ-off points via audio transformer.

These ACTINIUM signalings are righted and trickled by a crystal rectifier D1 and condenser C8, and the ensuing positive DIRECT CURRENT electric potential supplies a ahead diagonal junction transistor T2. Thus electronic transistor T2 behaves and forces the nucleotide of the relay number one wood electronic transistor T3 to ground level. The relay race is switched off and the warning signal colligated via N C electrical relay is enabled. If by chance, that the interloper alert and disenable the wireless sender electric battery, stock still distant alarum stays active therein, in the absence of the signaling, the recipient proceeds to create whooshing noise at the outturn. So the alarum is rainproof and very authentic.

Wireless Auto Tachometer Circuit

admin — Mon, 15 Jun 2009 02:56:22 +0000

To use the Tach, turn it on and let it sit for one minute to allow for temperature stabilization. Extend the antenna, select the right number of cylinders and hold the unit over the engine. If the reading is erratic or the needle jumps around, move the antenna closer to the ignition coil or spark plug wires.

Wireless Auto Tachometer Circuit

Using the Tach circuit, turn it on and let it sit for one minute to allow for temperature stabilization. Extend the antenna, select the right number of cylinders and hold the unit over the engine. If the reading is erratic or the needle jumps around, move the antenna closer to the ignition coil or spark plug wires.

: Wireless Auto Tachometer PCB

Accessory List.

C1 1 0.47uF Capacitor
C2 47uF Electrolytic Capacitor
D1 8V 1W Zener Diode
D2, D3, D4 1N914 Diode
M1 200uA Meter
Q1, Q2 2N3391A Transistor
R1, R2, R9 1K 1/2 W Resistor
R3 47K 1/2 W Resistor
R4 10K 1/2 W Resistor
R5, R6 25K Trim Pot
R7 10K Trim Pot
R8 200 Ohm 2 W Resistor
R1 15K 1/2 W Resistor
R1 2.2K 1/2 W Resistor
S1 SPST Togglae Switch
S2 Three Position Single Pole Rotary Switch

Remark:
1. Unit Calibration as folows:

1.1.Install the circuit:

1.2. Turn on the Tach and allow a few minutes for temperature stabilization.

1.3. Set S2 to 4 cylinders and adjust R5 for a meter indication of 180 (1800 rpm).

1.4. Set S2 to 6 cylinders and adjust R6 for a meter indication of 120 (1200 rpm).

1.5. Set S2 to 8 cylinders and adjust R7 for a meter indication of 90 (900 rpm).

2. Used the Tach, turn it on and let it sit for one minute to allow for temperature stabilization. Extend the antenna, select the right number of cylinders and hold the unit over the engine. If the reading is erratic or the needle jumps around, move the antenna closer to the ignition coil or spark plug wires.

3. This unit draws power from a car battery. If it is connected backwards, it will not work, but it won’t be damaged.