Unlike in English, the Spanish ch is always pronounced in the same way. Spanish cognates of English words where the "ch" has a different pronunciation are typically not spelled with a ch in Spanish. For example, the Spanish equivalent of "architect" is arquitecto.
Some older reference books may indicate that the CH in Spanish is considered to be a separate letter of the alphabet. However, that is no longer true.
Words and phrases in our audio lesson on pronouncing ch are muchas gracias, charlar, china and chino.