T&L Publications

Hi ,apparently where the phizo [speaker] is on the modem board is not for audio is for a digital "beep " only to let you know it's working.What you are hearing is the digital low level noize. Look around on the board and see if there are circuit "lands " toward the back edge of t...

Hi, for a simple sinewave generator 1khz [fixed frequency power oscillator] for LM386 please go to[ LM386 datasheet in Google] and download the datasheets from National Semiconductor. The wien network values can be changed for higher or lower frequencies fr=1/(2* 3.14159*R*C). This equation only app...

Hi ,I read the National application sheet wrong for the LM386 in my old databook and went to National and downloaded their newest datasheet. The series resistor is 47k and series capacitor is .01uf;the parallel resistor is 4.7k and it's cap is .01uf in the wien network for a 1khz sine wave. Remember...

Hi ,the function generator on page 38 N/V Sept. in the sine circuit [LM386] has many mistakes : this circuit should have a switched wien network for the course frequency and a dual variable resistor about 10k[part of the wein network] for fine frequency . The wien network goes from pin 5 in series t...

Hi I really searched Poptronics May 2000 and found the article on page 54. It says : Sadly ,after a long and distinguished history[1905],NTS went bankrupt and ceased operations around 1992, according to Los Angeles Times. It goes on to say :Old institutions seem to die off fastest when the economy i...

Hi I have the Poptronics May 2000 intact ,I looked through the pages for the School but there is no mention of it anywhere. I have the same type of nostalgic thing with a Company called J.C.DEAGAN Company in Chicago. I worked on the 6th floor of that building from Aug-Dec 1974 for a firm called Flex...

I made measurements on this transformer with a old Olson TE-189 CR analyzer [like Sprague TO-5,Allied 83Y124]I repaired recently which has "the magic eye" 6E5 for null indicator and a turns ratio function. The transformer is a power transformer [60hz]. Here is the data : pins 1,2 primary ....

Hi,to clarify my question the turn signals don't turn off automatically after making a turn of the wheel. Caprice Classic 1994.
Tim Rasch [email protected]

Hi, I am a consumer electronics technician asking why the Caprice Classic 1994 turn signals don't shut off automatically when they did so about one year ago. Is this a major problem in the steering column somewhere. I am not too familiar with auto electrical systems. The car has about 200000 miles o...

Hi .I can't tell by measuring on a lcr meter what this transformer is for .Here are the measurements:pins 1.2[60.2 ohms,1.8 henry];pins 3,4[12.8 ohms,.230 henry];pins 4,5[7 ohms,56.2 millihenry]. pin 4 is the middle lead .pins1.2 are isolated from pins 3,4,5. help would be greatly appreciated. Tim R...

Hi ,I am a service technician for >30 years and most of the time the 8 pin eeprom fails which is a cheep part [about $8] but get it only from JVC only because a blank one will play dead too. A lot of RCA's have this problem with their 8 pin eeprom. You did the right thing measuring the voltages for ...

Hi ,a friend gave Me a box of old parts : transistors ,diodes,switches,transformer,etc . Anyway I need the specification /data sheet for the Sangamo N17-T-72484-6834/881127. I can't find anything on Google.I think it is a Audio output for 6L6 push pull drive, 3 terminals center tapped and other two ...

Hi ,Timothy Rasch again;I have worked in the electronics consumer repair business for >30 years . The Radio Shack parts I bought 30 years ago are still working in a lot of equipment and their new parts [LM317] to be specific are good quality. I found three LM317 in stock at Radio Shack Sunday. I hav...

What happened to Radio Shack RSU service where a person could order special parts not in Radio Shack stores? I tryed to find a LM 317 adjustable regulator today, that Radio Shack had about 6 months ago. Can't be found now. Everybody better start stocking up with Radio Shack parts before there isn't ...

The email address should be [email protected] Tim Rasch