Collection Schematic

Showing posts with label super. Show all posts

Wednesday, October 29, 2014

SUPER EAR

This circuit is a very sensitive 3-transistor amplifier using a speaker transformer. This can be wound on a short length of ferrite rod as show above or 150 turns on a 10mH choke. The biasing of the middle transistor is set for 3v supply. The second and third transistors are not turned on during idle conditions and the quiescent current is just 5mA.

The project is ideal for listening to conversations or TV etc in another room with long leads connecting the microphone to the amplifier.

source : http://www.talkingelectronics.com.au/projects/200TrCcts/200TrCcts.html

Monday, September 8, 2014

Super Ni Cd Battery Charger 12 18V Wiring diagram Schematic

A clever charger schema that safely can charge any Ni-Cd battery. Offers charge current sellection, polarization detection and protection and the ability to connect many batterys in siries. Ni-Cd bateries can be recharged more than 1000 times before become useless. the charging current shoud be the 1/10 of the (Ah) of the battery. The bateries need 14 hours to be fully charged.Swhitch S2 is the current selection as folows: 50mA, 200mA and 400mA. LED D10 is the indicator for proper batery connection and/or wrong polarity checking. LED D9 is the charging indicator. The transformer is a 220V/2x12V 0.5A.

Super Ni-Cd Battery Charger 12-18V Circuit Diagram

PARTS LIST

R1,R4,R5=10K

R2,R3=100K

R6,R8,R10=1K

R7=820

R9=100

R11=15

R12=3,9

R13=1,8

C1=1000uF/40v

C2=470pf

D1-D4,D6=1n4001-7 D7,D8=1n4148

D9,D10=LED IC=741

TR1=BC548

TR2=BD137

TR3=2N3055

Datasheet file1: Click here to download LM741.pdf datasheet.

Datasheet file2: Click here to download BC548.pdf datasheet.

Datasheet file3: Click here to download BD137.pdf datasheet.

Datasheet file4: Click here to download 2N3055.pdf datasheet.