jbcapacitors blog

Since jb Capacitors Company launched JFZ in year 2015, so far we have received lots of favourable feedback not only in pricing but also in quality aspect.
Same as most of our film capacitors, we do ammo packing for customer on special request, our JFZ also provides this service.

Moreover, we even can provide cut leads with ammo packing. Please let us know of you have any special request, we jb people will try to make it come true.
We are just your best choice.

http://www.jbcapacitors.com/Plastic-Film-Capacitors/JFZ-X2-Metallized-Polypropylene-Film-Capacitor.html

jb strong series X2 capacitors JFZ, with ENEC VDE UL certification for 310VAC, from 1000pF to 4.7uF

Prezados Senhores,
Bom dia!
Eu sou um gerente de Vendas da Empresa jb capacitores. Ha hum ritmo atras enviei e-mails alguns ... Voce lembra da Nossa Empresa?

A jb capacitores E hum Fabricante com Certificado ISO, Que produz e vende DESDE 1980 Mais de 22 Tipos de capacitores Filme plastico MKT, MKP ...
ESTAMOS localizados los HK e Taiwan com Tecnologia avancada e vendemos Qualidade com precos atrativos

Aqui eu recomendo que voce a nossa serie mais forte - JFZ X2 capacitores de filme metalizado polyproylene, temos aprovacoes ENEC VDE UL, muito popular no mercado e aproveitar repuation bom no mercado, por favor, confira abaixo nosso guia cruz e imagem, por favor envie o seu lista de pedido de orcamento! Amostras gratis tambem estavam disponiveis!

JFZ X2 capacitores de filme metalizado polyproylene, temos aprovacoes ENEC VDE UL
Capacitacne: 1000pF ~4.7uF
Rated Voltage: 310VAC
Tolerance: +/-10%

An old saying goes "No pains, No gains."  
In this year, jb Resource and Development department sacrificed lots of time and energy on designing your new product JSX.

In the process we encountered complicated engineering problems, once upon a time, we had an idea to give up.
But we are not. Perseverance and devotion make us success in the end. 
We consulted to some rich experienced audio capacitors designers and collected vast end user's using findings to upgrade and improve our JSX.

At the moment, we would like to invite you enjoy the most true testimonials about or JSX Superior Metallized Polypropylene Film Capacitors.
Believe it or not, you can try our JSX yourself and let us know how you comment about it.

http://www.jbcapacitors.com/pdf/JSX-Superior-Metallized-Polypropylene-Film-Capacitors-Axial-Test-Reviews.pdf

In the search of a affordable audio capacitors for decoupling purpose, I have got the JFX and JSX series from jb Capacitors. Now I will explain how they are compared with a a few others of similar size range.

Tested capacitors:
JSX: 2.2uF/250V
JFX: 2.2uF/400V
Mundorf Mcap 2.2uF/250V
Mundorf EVO 2.2uF/450V
Clarity Cao PX 2.2uF/250V

To have similar requirements I have a relay switch board next to my  pre-amp direct out from DAC. All DC coupled and no other capacitors in this way. DAC output impedance is 47Ohm, Pre-amp impedance is 470kOhm. These are very common values and should be give a good start point for comparisons. I can switch direct from capacitor to capacitor and DC coupled.

Mesurements are all very good. most below my measuring equipment. The tolerances where all below the printed 5%(JFX) and 3%（JSX）. I have measured 1.36% and 0.99%.
The dielectric dissipation factor has been tan:<0.001 at 1kHz.

Listening test:
JSX: Clear, detailed, wide and open up presentation
JFX:  Detailed, gives a realistic soundstage and stress free listening. very natural and a good tonal balance. My favourite for acoustic instruments and voices.

Mcap:
Clear with more midrange. Makes sound a bit hard and grained.

EVO:  
Detailed and holographic presentation, seems to be a bit louder, but tonal balance is not perfect. After longer listening I feel like disrupted soundstage. 

Clarity Cap PX:
Musical and warm, but less detailed.

After burning in with 24hrs:
JFX: well balanced with more 3 dimensional stage, warm finish
JSX: clean and clear with rich details, but flatter sound stage
Overall both types are very high quality and for sure a good choice for a competitive price.

Summary:
jb Capacitors has surprised me with excellent capacitors. They are not expensive, small sized and good sounding. They beat most of even more expensive capacitors. Well done!

Best regards
Alex
Dial-Audio

More information please check below link:
http://www.jbcapacitors.com/Plastic-Film-Capacitors/JFX-Premium-Metallized-Polypropylene-Film-Capacitors-Axial.html
http://www.jbcapacitors.com/Plastic-Film-Capacitors/JSX-Superior-Metallized-Polypropylene-Film-Capacitors-Axial.html

We have very strong support for below top sellers, please check with our sales for prices and details. 

Film Capacitors: 
JFZ- X2 Metallized polypropylene film capacitors,ENEC VDE UL  310VAC
JFB- Metallized polyester film capacitors, dipped type--CL21 
JFX&JSX--Audio capacitors--MOQ 100pcs/item
JFS- Motor running capacitors--MOQ 100~300pcs/item

Aluminum Electrolytic Capacitors:
JRA~JRG--THT type Aluminum electrolytic capacitors
JCS~JCF-- SMD type Aluminum electrolytic capacitors
JNC~JNK- Snap-in terminals
JMJ~JMQ--Screw terminals

Today we would like to share a piece of capacitance testing lesson with all of our jb customers.

Customer Sent: Thursday, July 09, 2015 6:48 PM
We received the capacitors from you and all cartons are ok, thank you.
First of all I want to thank you for the samples and gifts that you sent, I appreciate your kindness.
I checked all models of motor capacitors to see if they have the right capacity value.
The models between 10u and 80u have the right capacity, many models have 2-3% bigger capacity than rated, this is very good.
For example, 30uF has in fact 31uF.

The problem is with the models 100uF and 120uF.
100uF has in fact around 91uF; 120uF has in fact around 101uF

I would like to know why these models have such a low capacity.
I didn't expect to have such differences, I consider jb Capacitors to be a big factory with good quality.
It is important to know, I hope that next time we can find a solution to make these models with the rated capacity.

jb Capacitors Response: Thursday, July 13, 2015 12:45 PM
Before goods leaving our factory, we did all necessary electrical performance test & inspect, totally 3 times.
we made a JFS-15 100uF capacitor test with HF2618 instrument, a professional instrument for capacitance test.

Customer Sent: Thursday, July 16, 2015 5:48 PM
I am very glad to tell you that we tested the motor capacitors 100u and 120u with an oscilloscope that can also measure capacitance and the result is positive, the capacitors have indeed around 100u and 120u.
There is no problem to measure capacitors less than 100u with this general multimeter 9205, but for bigger capacitors we need indeed to use a professional instrument.
So I am glad that there is no problem with these capacitors from you. We are planning our next order very soon.http://www.jbcapacitors.com/

jb JFD box MKT film capacitors, do you know it? good prices with excellent and stable quality.

Its box technology and small size make it's more easier for your PCB assembly.

Cross reference: Kemet R60, Wima MKS 4, Vishay MKT 1820, MKT 1822, Epcos B 32521~B 32524

Application: General Purpose

Standard lead length: 18mm minimum, can do longer or cut lead.
Package: Bulk & Ammo
Popular voltage: 1J (63V), 2A (100V), 2C (160V), 2E (250V), 2G (400V), 2J (630V), 3A (1000V)

Samples Tested by Mr. HF Choi
jb JSX - Superior Metallized Polypropylene Film Capacitors - Axial
JSX  1.0uF 250V +/-3% Bulk RoHS,  4pcs 

Datasheet link: http://www.jbcapacitors.com/pdf/JSX-Superior-Metallized-Polypropylene-Film-Capacitors-Axial.pdf

Introduction of Mr. HF Choi
My name is HF Choi I am in the UK and looking for quality JSX cap for DIY hifi.  

Original letter from Mr. HF Choi
I received the capacitors a couple weeks ago and have installed them in my DAC.

I installed the 4 JSX 1uF caps as bypass on the output electrolytic caps of the DAC (2 caps per channel, each 150uF), so the bypass was less than 1%.
Immediately on first listen I could hear that the bass was bloated and the soundstage was closed in but the treble was a bit sweeter.

I let the DAC continue to play for 50 hours after which the bass improved dramatically.  It sounded like an extra octave lower was added.
Also, the treble was becoming more tangible and fine details throughout the frequency range became audible whereas before they were not.  
Nuances now audible in the music making instruments sound more real changed the tonality of entire pieces of music.
It slowed the music down somewhat for some fast bass music but also sped up music with fast transient treble.
Nice, as this probably means there's now less signal smearing and timing issues.

I find there's now a less of a difference between redbook tracks and DSD tracks.  
Both sound smooth and detailed now but DSD more dynamic with good recorded material.
Still very enjoyable with the improvement in tonality, timing, low level detail and nuances, and improved frequency extension - and of course price is very good. I’ve used them for hundreds of hours so far.

I chose the JSX because of the small size. Compared with large and expensive Mundorf and similar grade caps, it is an easy choice. Very high price/performace ratio with the JSX.
I am very satisfied with the performance of the JSX . Thanks for a great product! 

1. JFX &JSX - Premium & Superior metallized polypropylene film capacitors--Axial type(cross capacitors) 
Mainly used in  Audio equipement, cross overs; our MOQ is low, prices unbeatable, very excellent replacements of Mundorf, Jantzen audio , solen,ERSE etc.. 

2. JFA - Mylar Polyester Film capacitor(CL11) --- Mainly used in Energy saving lamps, demand is huge, cost is low.

3. JFB - Metallized Polyester film capacitor(CL21)--dipped type  --- cross to Vishay MKT 368, Epcos B32591~B32594, mainly used in power supplies, electronics ballasts etc..our prices & lead time are very good.

4. JFD - Metallized Polyester Film capacitors(CL23)--Box type  ---Cross to Arcotronics R60, Epcos B32520~32524, European customers prefer it, as it is box type, nicer..

5. JFG - Axial metallized polyeter & polypropylene film capcitor(CL20&CBB20) -- Cross to Arcotronics(Kemet) MKT A50, MKP A70 ,  Vishay MKT1813, MKP1839, 1845, jb capacitors prices are unbeatable.

6. JFP - High voltage Metallized Polypropylene film capacitors (CBB81), -- mainly used in electronics ballast, cross to Epcos B32692, prices and lead time unbetable, quality is very reliable.

7. JFV&JFZ - X2 Metallized polypropylene film capcaitors(ENEC VDE UL Approvals)--jb top sellers, cross to Arcotronics R46, prices & lead time are very good. with ENEC VDE UL approvals, quality is very reliable.

Please contact Ms. Lilian Zhu for more details at  info@jbcapacitors.com

When talking about motor capacitors, the first idea come into your mind is some overseas brand, such as Epcos, AVX and Kemet.  
HongKong brand " jb "  also offers a wide range of products for motor start and run applications in plastic and aluminum cans.  
JFS - 6 is one of the most popular items in our production line.

Application:
The capacitors described in the current catalogue are specifically designed for the start and the run of single-phase electric motors. 
Usually the capacitor is connected in series to an inductive winding into an auxiliary circuit for a single-phase motor or in parallel  phase/phase into three-phase motors when powered by a single-phase circuit.

Safety Class:
The degreee of safety is marked on the capacitor according to the following symbols:
(P2) the capacitor has been designed to fail only in case of circuit cut-off and it is protected against fire and electrocution risk.
(P1) the capacitor can fail either by a circuit cut-off or by a short-circuit and it is protected against fire and electrocution risk.
(P0) in case of failure, the capacitor does not have any particular protection.

For more details please check : 
http://www.jbcapacitors.com/Plastic-Film-Capacitors/JFS-Motor-Capacitor.html