About Us 408-622-9851

Mastech is an established name in variable DC power supplies with over 30 years of experience in making high quality DC power supplies. Mastech power supplies are widely used by the engineering, scientific, and hobbyist community. Acifica, Inc. is the biggest volume seller of Mastech power supplies in US, and we carry the widest selection than any other sellers. All of the products are inventoried in our warehouse in San Jose, California, so that you will typically get your order within 1-5 business days from the date of ordering. In the rare cases when a product is out of stock temporarily, we will notify you promptly.

For new developments, please check out the official Mastech Blog.


We have been selling on eBay for over 10 years with over 99% positive feedback ratings

We recently started selling on Amazon with 100% positive feedback ratings.


Business Hours:

9:00 am - 5:00 pm Pacific Standard Time M-F

Contact Information:

By email: support@mastechpowersupply.com

By standard mail:
Acifica, Inc.
2345 Harris Way, Suite #2
San Jose, CA 95131

By phone:

By Fax:

Ordering Information:

We use PayPal ExpressCheckout for orders placed directly online, you do not need to have a PayPal account to place an order using your credit card.

To order by credit card directly with our representatives, please call us at 
408-622-9851 or or fax us at 408-498-4558.  

To order by PayPal, send payment to support@mastechpowersupply.com.

To order by check or money order, please send payment with note to: Acifica, Inc., 3241 Simberlan Dr, San Jose, CA 95148

Your note should include your shipping address, product you are ordering, and your phone number or email address for order confirmation.

Shipping Information:

Orders typically will be shipped within 24 business hours from the time your payment is received.


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