1100 charging problem

August 16th, 2008

1100 charging problem

1100 charge ways new

August 16th, 2008

1100 charge ways new

1100 CHARGE FINAL2

August 16th, 2008

1100-charge-final2.JPG

1100 CHARGE FINAL

August 16th, 2008

1100 CHARGE FINAL

1100 buzzer problem new

August 16th, 2008

1100 buzzer problem new

1100 bay samirsana

August 16th, 2008

1100 bay samirsana

1100 2300 not charging

August 16th, 2008

1100 2300 not charging

12v to 220v inverter UPS 500w Circuit

May 18th, 2008

HELLO

500w 220v inverter UPS

12v 220v inverter UPS 500w Circuit

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TKX.

FM Transmitter

February 17th, 2007

Here is the schematic, PC board pattern, and parts placement for a low powered FM transmitter. The range of the transmitter when running at 9V is about 300 feet. Running it from 12V increases the range to about 400 feet. This transmitter should not be used as a room or telephone bug.

 

Schematic


  

PC board layout and parts placement


  

Parts:

Part Total Qty. Description Substitutions
C1 1 0.001uf Disc Capacitor 
C2 1 5.6pf Disc Capacitor 
C3,C4 2 10uf Electrolytic Capacitor 
C5 1 3-18pf Adjustable Cap 
R1 1 270 Ohm 1/8W Resistor 270 Ohm 1/4W Resistor
R2,R5,R6 3 4.7k 1/8W Resistor 4.7K 1/4W Resistor
R3 1 10k 1/8W Resistor 10K 1/4W Resistor
R4 1 100k 1/8W Resistor 100K 1/4W Resistor
Q1, Q2 2 2N2222A NPN Transistor 2N3904, NTE123A
L1, L2 2 5 Turn Air Core Coil 
MIC 1 Electret Microphone 
MISC 1 9V Battery Snap, PC Board, Wire For Antenna
 

Part
Total Qty.
Description
Substitutions

 

Notes:

1. L1 and L2 are 5 turns of 28 AWG enamel coated magnet wire wound with a inside diameter of about 4mm. The inside of a ballpoint pen works well (the plastic tube that holds the ink). Remove the form after winding then install the coil on the circuit board, being careful not to bend it.

2. C5 is used for tuning. This transmitter operates on the normal broadcast frequencies (88-108MHz).

3. Q1 and Q2 can also be 2N3904 or something similar.

4. You can use 1/4 W resistors mounted vertically instead of 1/8 W resistors.

5. You may want to bypass the battery with a .01uf capacitor.

6. An antenna may not be required for operation.

hellow all for this new circuit

November 10th, 2006

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