Build your own Test Equipment !!!

[Carlos]

Hola a todos, adjunto a esta les envio un circuito de un conmutador de 8 canales para acoplar a un osciloscopio de un solo canal, asi el osciloscopio se transforma en un osciloscopio de 2 canales, 4 canales y 8 canales. Yo no lo arme pero seguro que funciona, dice el articulo que es especial para circuitos CMOS y TTL.
Carlos

Hello everybody, this attachment to send them a circuit of an 8-channel switch to attach to a single-channel scope, so the scope is transformed into a scope with 2 channel, 4 channel and 8 channel. I do not build but sure that it works, says the article which is special for CMOS and TTL circuits.

Carlos

[Eugene52]

Build your own Test Equipment !!!

Carlos , this last one you posted is the best !! It is in spanish , so if we need help we will contact you . Later when I have time , I will try to put this 6 page article into a new "PDF" folder for easy copying . We are now done with finding a function/signal generator !!! Next on our search will be for a schematic of a Good and Cheap "inductance meter" !!..............Regards....Eugene

[Carlos]

Yes, is all the article. it work very well. I build in 1987 and there are any broblems!!!!


Carlos

[Eugene52]

Build your own Test Equipment !!!

Thank-You again Carlos !!! Just when I think we have a good circuit , another good one gets posted !!! Did you post the complete article ?? I have 7 pages here 201-207 ?. Now I am looking up the I.C. numbers because this article is dated 1986...............Regards...............Eugene

[Carlos]

Hola a todos, aqui les envio un generador de pulsos, indispensable para el laboratorio, las caracteristicas estan en la pagina 3 espero que les sea util a aquellos que trabajan con detectores tipo PI
Carlos


Hello everybody, here they sent a pulse generator, which is essential for the laboratory, the features are on page 3 I hope you find it useful to those who work with type detectors PI

Carlos

[Eugene52]

Build your own Test Equipment !!!

Thank-You for posting the "Minimalist Oscilloscope" Fred , It brings back many memories for me . Years ago I owned a lot of tube-type equipment , from tube type oscilloscopes to many "Heathkits" and even had tube-type "Graymark" a.m. transmitter kits I bought and built , even had a "top of the line" V.T.V.M. , vacume tube volt meter . Some Memories can sure make the Altzheimers go away !!!!!....................Regards............Eugene

[Fred]

Just for the fun ...

[ron_o]

Build your own test equipment:- psu

Hi Eugene

Take a look at ST Microelectronics L200 Adjustable Voltage and Current Regulator data sheet. It is far more versatile than the LM317 and can deliver up to 2 amps. The above datasheet shows example circuits. I built the variable psu circuit shown several years ago.
Regards
ron

[Eugene52]

Build your own Test Equipment !!!

Thank-You ron_o , that is the best circuit I have seen so far . I need to check the availability and cost of the I.C. and the transformer . But most of the other parts are in my scrap pile................Regards..............Eugene

[ron_o]

What I am looking for now , are schematics for a dc power supply !!! 0-16 volts d.c. , adjustable is fine , one amp max with over-current protect is perfect . Any Schematic is welcome , and then we will decide which is the best one to build !! Solid-state Heathkit schematics are welcome Too !!! Thank-You for your comments and schematics.................Take Care...........Eugene

Take a look at Tony Van Roon's web site. Just search in google etc for tony van roon.

Regards
R.F.O

[Eugene52]

Build your own Test Equipment !!!

Here is one that I like , the schematic from this public website has some missing component values , but the circuit is close to meeting the requirements of what I want for my work bench . So we are "Getting Closer".......................Eugene

[Eugene52]

Bench top D.C. power supply

[quote=Götz von Berlichingen;80299]Thanks, i found a nice Schematic of a LM317 (or better)
Power Supply there.
http://www3.telus.net/chemelec/Proje...wer-Supply.htm
The little "Hack" to get 0 Volts minimum is included.

If someone wants High Power without a huge Heatsink,
a switching Power Supply is the only Way.
Dont forget the Fact that most Projects need very low Current,
1 Ampere is plenty for most Electronic Circuits.[/quote

Thanks everyone !!! For quick responses . I checked Gary's Chemelec site , a bunch of very good projects , but What I need is a variable dc voltage supply . And I am a person that needs over current protect . 1 amp continuous load or a little less is perfect . I know more schematics and information will be posted here soon on Geotech...............Thanks ..................Eugene52/Member/Stalni-Clan

[Carl-NC]

If someone wants High Power without a huge Heatsink,
a switching Power Supply is the only Way.

Use a multi-tapped transformer with auto-switching. Technically this makes it a "switching" power supply but without the switching noise.

- Carl

[Götz von Berlichingen]

Let's not overlook one of the members here who has a lot of projects on his website:

http://www3.telus.net/chemelec/Projects/Projects.htm

Now, if only he would get that 2 box project going.

Thanks, i found a nice Schematic of a LM317 (or better)
Power Supply there.
http://www3.telus.net/chemelec/Proje...wer-Supply.htm
The little "Hack" to get 0 Volts minimum is included.

If someone wants High Power without a huge Heatsink,
a switching Power Supply is the only Way.
Dont forget the Fact that most Projects need very low Current,
1 Ampere is plenty for most Electronic Circuits.

[Fred]

forgiveness, committed an error, the correct regulador is the LM350, which provides a maximum current of 3 amperes

Carlos

The problem with those regulators is power dissipation if you want a large range of voltages.
For example if we want 5 to 16 v we need a 20v input, then with a 5V-3A output we will have 15X3 = 45W heat dissipation : too much for the IC.
regards,
Fred.